Eczema Notes

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1. Definition and Overview of Eczema

Eczema is a broad term used for a group of inflammatory skin disorders characterized by itching, dryness, redness, scaling, and disruption of the normal skin barrier. The word “eczema” does not refer to a single disease. Several distinct conditions can produce eczematous inflammation, including atopic dermatitis, contact dermatitis, dyshidrotic eczema, nummular eczema, seborrheic dermatitis, and stasis dermatitis. Among these, atopic dermatitis is the most common form of eczema.

Eczema may occur at any age, although atopic dermatitis commonly begins during infancy or childhood. The disease often follows a chronic, relapsing course, with periods of active inflammation known as flares alternating with periods when the skin improves. The severity can range from a few dry, itchy patches to extensive inflammation affecting large areas of the body.

The fundamental abnormality in many forms of eczema is impairment of the skin barrier combined with an exaggerated or inappropriate inflammatory response. A healthy epidermal barrier limits water loss and protects the body from irritants, allergens, microorganisms, and other environmental exposures. When this barrier becomes defective, the skin loses moisture more easily and becomes increasingly susceptible to irritation and inflammation.

Pruritus is one of the most important clinical features. In many patients, itching may occur before obvious skin changes become apparent. Scratching provides temporary relief but can further damage the epidermis, producing a cycle commonly referred to as the itch–scratch cycle. Repeated scratching may cause excoriations, bleeding, secondary infection, and chronic thickening of the skin.

Eczema can have a substantial effect on quality of life. Persistent itching may interfere with sleep, concentration, school performance, work, physical activity, and social functioning. Severe disease may also cause emotional distress and frustration because symptoms can recur despite apparently adequate treatment.

Although eczema, particularly atopic dermatitis, is generally considered a chronic condition without a definitive permanent cure, appropriate management can provide excellent control. Modern treatment focuses on restoring the skin barrier, reducing inflammation, controlling itching, identifying relevant triggers, preventing flares, and treating complications. Current guidelines include conventional topical treatments as well as newer biologic and small-molecule therapies for selected patients with moderate-to-severe disease.

2. Classification and Types of Eczema

Eczema can be classified according to its clinical appearance, underlying mechanism, distribution, and triggering factors. Correct classification is important because different forms have different causes, distributions, associated conditions, and treatment strategies.

Atopic Dermatitis

Atopic dermatitis is the most common form of eczema and is characterized by chronic pruritus, xerosis, epidermal barrier dysfunction, and cutaneous inflammation. It frequently begins in childhood and may be associated with other atopic disorders such as asthma and allergic rhinitis.

The condition results from an interaction between genetic susceptibility, immune dysregulation, epidermal barrier abnormalities, and environmental factors. Mutations affecting proteins involved in epidermal barrier function, particularly filaggrin in some patients, can increase susceptibility to skin-barrier dysfunction.

Contact Dermatitis

Contact dermatitis occurs when the skin develops inflammation after exposure to an external substance. It is broadly divided into irritant contact dermatitis and allergic contact dermatitis.

Irritant contact dermatitis results from direct chemical or physical damage to the skin. Frequent handwashing, detergents, solvents, acids, alkalis, and prolonged exposure to water can contribute to this condition.

Allergic contact dermatitis is a delayed hypersensitivity reaction in which the immune system becomes sensitized to a particular substance. Common allergens include fragrances, preservatives, nickel, hair dyes, topical medications, rubber-related chemicals, and certain cosmetic ingredients.

Dyshidrotic Eczema

Dyshidrotic eczema, also called pompholyx, typically affects the palms, sides of the fingers, and soles of the feet. It is characterized by intensely itchy, small, deep-seated vesicles. The vesicles may later dry, peel, and develop fissures.

The condition may be recurrent and can become particularly troublesome when the hands or feet are heavily involved. Because several other disorders can produce vesicles on these sites, accurate clinical diagnosis is important.

Nummular Eczema

Nummular eczema produces round or coin-shaped inflammatory plaques. Lesions are often itchy and may become scaly, crusted, or weeping. The arms and legs are common sites of involvement.

Nummular eczema may be associated with dry skin and can be exacerbated during periods of low humidity. Its circular appearance can sometimes resemble fungal infection, making differentiation clinically important.

Seborrheic Dermatitis

Seborrheic dermatitis affects areas rich in sebaceous glands, particularly the scalp, eyebrows, nasolabial folds, ears, and central face. It produces erythema with fine or greasy scaling and may range from mild dandruff to more extensive inflammatory disease.

The condition is associated with an inflammatory response involving Malassezia species and sebaceous gland activity. It can be chronic and recurrent.

Stasis Dermatitis

Stasis dermatitis generally occurs on the lower legs in patients with chronic venous insufficiency. Increased venous pressure contributes to edema, inflammation, skin discoloration, scaling, and sometimes ulceration.

Management requires attention not only to the inflammatory skin changes but also to the underlying venous disease.

Hand Eczema

Hand eczema may result from multiple overlapping mechanisms, including atopic predisposition, irritant exposure, and allergic contact sensitization. It is particularly common in people whose occupations involve frequent handwashing, wet work, detergents, chemicals, or repeated exposure to irritants.

Because hands are continuously exposed to the external environment, hand eczema can become chronic and difficult to control unless occupational and environmental triggers are addressed.

3. Etiology and Risk Factors of Eczema

The etiology of eczema is multifactorial. No single cause explains all cases. Instead, disease develops through interactions between genetic predisposition, immune abnormalities, epidermal barrier dysfunction, environmental exposures, microorganisms, and individual triggers.

Genetic Predisposition

Genetic factors have an important role, particularly in atopic dermatitis. Individuals with a family history of atopic dermatitis, asthma, or allergic rhinitis may have an increased susceptibility to developing the disease.

One important genetic factor involves abnormalities in proteins responsible for maintaining epidermal barrier integrity. Filaggrin is particularly important because it contributes to the organization and hydration of the stratum corneum. Filaggrin-related abnormalities are associated with increased susceptibility to barrier dysfunction and atopic dermatitis in a subset of patients.

However, the presence or absence of a specific genetic abnormality does not by itself determine whether a person will develop eczema.

Skin Barrier Dysfunction

The outermost layer of the epidermis acts as a protective barrier. It reduces transepidermal water loss and limits penetration of irritants and allergens.

In eczema, this barrier may become defective. Increased water loss produces xerosis, while increased permeability allows environmental substances to penetrate the skin more readily. These substances can stimulate inflammatory pathways and further damage the barrier.

This creates a self-perpetuating cycle:

Barrier dysfunction → increased water loss → dry skin → increased penetration of irritants/allergens → inflammation → itching → scratching → further barrier damage.

Regular use of moisturizers is therefore an important component of eczema management because improving hydration and supporting barrier function can reduce dryness and help decrease flares.

Immune Dysregulation

Immune abnormalities contribute substantially to eczema, particularly atopic dermatitis. The disease involves complex interactions between innate and adaptive immune pathways.

In atopic dermatitis, type 2 immune signaling has an important role. Cytokines such as interleukin-4 and interleukin-13 contribute to inflammation and can interfere with normal epidermal barrier function. This understanding has led to the development of targeted biologic therapies that interfere with specific inflammatory pathways.

Environmental Factors

Environmental exposures can initiate or aggravate eczema. Important factors include:

• Cold and dry weather
• Excessive heat
• Sweating
• Low humidity
• Wool or rough clothing
• Fragrances and perfumes
• Harsh soaps
• Detergents
• Certain cosmetics
• Chemical exposure
• Frequent bathing or handwashing
• Occupational irritants
• Psychological stress

Triggers vary considerably between individuals. Therefore, identifying personal triggers is more useful than assuming that every environmental factor will affect every patient.

Irritants

Repeated exposure to irritants can damage the skin barrier. Detergents, cleaning products, solvents, disinfectants, and prolonged water exposure are particularly important in occupational eczema.

Healthcare workers, cleaners, food handlers, hairdressers, mechanics, and other workers with frequent hand exposure may be at increased risk of irritant hand dermatitis.

Allergens

Some patients develop allergic contact dermatitis after sensitization to a particular allergen. Important examples include nickel, fragrances, preservatives, hair-dye ingredients, rubber chemicals, and topical medications.

Allergic contact dermatitis should be suspected when eczema has an unusual distribution, is persistent despite appropriate treatment, or appears to correlate with exposure to a particular product or occupation.

Psychological Stress

Stress does not necessarily cause eczema by itself, but it can aggravate disease in susceptible individuals. Stress may influence immune function, scratching behavior, sleep, and adherence to skin-care routines.

Patients may therefore experience worsening symptoms during examinations, occupational difficulties, family stress, or other periods of psychological strain.

Microbial Factors

The skin microbiome is altered in many patients with eczema. In atopic dermatitis, Staphylococcus aureus can become abundant on affected skin, particularly during flares. Microbial colonization can interact with the impaired skin barrier and inflammatory response.

Importantly, the presence of bacteria on eczematous skin does not automatically mean that systemic or topical antibiotics are required. Antimicrobial treatment should generally be reserved for clinically suspected or confirmed infection rather than routine treatment of uncomplicated eczema. Current AAD guidelines recommend against routine topical antimicrobials and antiseptics for atopic dermatitis.

4. Pathophysiology of Eczema

The pathophysiology of eczema involves a complex relationship between epidermal barrier impairment, immune dysregulation, genetic susceptibility, environmental triggers, and neuroimmune mechanisms.

Epidermal Barrier Abnormality

The stratum corneum is often described as a “brick-and-mortar” structure. Corneocytes act as the bricks, while intercellular lipids form part of the mortar. Proteins and lipids within this structure help maintain hydration and protect the skin from external substances.

In eczema, this barrier becomes compromised. Reduced barrier integrity leads to increased transepidermal water loss and allows irritants and allergens to penetrate more easily.

Reduced levels or altered organization of epidermal lipids, abnormalities in structural proteins, and inflammatory changes may all contribute to this dysfunction.

Immune Activation

Once the skin barrier becomes impaired, environmental substances and microbial products can penetrate more easily and stimulate immune responses.

In atopic dermatitis, type 2 inflammation is particularly important. IL-4 and IL-13 signaling contributes to inflammatory changes and further impairs epidermal barrier function. This creates a reciprocal relationship in which inflammation worsens barrier function while barrier dysfunction promotes further inflammation.

This understanding explains why targeted therapies against inflammatory pathways can produce substantial improvement in selected patients with moderate-to-severe disease. Modern guidelines include several biologic agents and Janus kinase inhibitors among systemic treatment options for appropriately selected patients.

Pruritus and the Itch–Scratch Cycle

Itching is not simply a secondary consequence of visible inflammation. Neuroimmune mechanisms directly contribute to pruritus in eczema.

Inflammatory mediators can stimulate cutaneous sensory nerves, producing intense itching. The patient scratches the affected area, causing mechanical trauma and disrupting the epidermis.

Repeated scratching leads to:

Itching → scratching → epidermal injury → increased inflammation → greater itching.

Over time, chronic scratching can produce lichenification, characterized by thickened skin with exaggerated skin markings.

Acute and Chronic Inflammation

The morphology of eczema changes depending on the duration and severity of inflammation.

Acute eczema may show:

• Erythema
• Papules
• Vesicles
• Oozing
• Crusting
• Marked itching

Chronic eczema is more likely to demonstrate:

• Xerosis
• Scaling
• Thickening
• Lichenification
• Fissuring
• Excoriations
• Changes in pigmentation

These features may coexist in the same patient because different lesions can be at different stages of the disease process.

5. Atopic Dermatitis

Atopic dermatitis is a chronic inflammatory skin disorder characterized primarily by pruritus and eczematous lesions occurring in a characteristic age-dependent distribution. It commonly begins during childhood but can persist into adulthood or develop later in life.

The disease is associated with epidermal barrier dysfunction and immune dysregulation. Patients may also have a personal or family history of other atopic diseases.

Infantile Atopic Dermatitis

In infants, atopic dermatitis often begins on the face and scalp and may extend to the trunk and extremities. The cheeks may become erythematous, dry, scaly, or excoriated.

The diaper area is often relatively spared in classic atopic dermatitis because the moist environment and occlusion may alter the characteristic pattern.

Childhood Atopic Dermatitis

As children grow, lesions commonly become more prominent on the flexural surfaces, especially the antecubital and popliteal fossae.

Repeated scratching may produce excoriations and lichenification. Dry skin is often prominent.

Adult Atopic Dermatitis

Adults may have eczema involving the flexures, face, neck, hands, eyelids, and other areas. Hand eczema can be particularly disabling because it interferes with daily activities and occupational tasks.

Adult disease may also present with more chronic thickening and pigmentation resulting from long-standing inflammation and scratching.

Diagnosis is primarily clinical. A detailed history and physical examination are usually sufficient, although additional testing or biopsy may occasionally be necessary when the diagnosis is uncertain or another skin disorder needs to be excluded.

6. Contact Dermatitis

Contact dermatitis develops when the skin reacts to an external substance. It is divided into irritant contact dermatitis and allergic contact dermatitis, although both mechanisms can coexist.

Irritant Contact Dermatitis

Irritant contact dermatitis results from direct injury to the skin rather than an antigen-specific immune response.

Common irritants include:

• Detergents
• Soaps
• Disinfectants
• Solvents
• Acids
• Alkalis
• Repeated water exposure
• Friction
• Occupational chemicals

The hands are particularly vulnerable because they are frequently exposed to water, cleaning products, and mechanical trauma.

Allergic Contact Dermatitis

Allergic contact dermatitis is a type IV delayed hypersensitivity reaction. The patient becomes sensitized to an allergen, and subsequent exposure triggers an immune response.

Common allergens include:

• Nickel
• Fragrances
• Preservatives
• Hair-dye chemicals
• Rubber accelerators
• Topical antibiotics
• Cosmetic ingredients
• Adhesive components

Lesions may occur at the site of direct exposure but can sometimes extend beyond it.

Clinical Importance

A detailed exposure history is essential. Clinicians should ask about occupation, cosmetics, soaps, detergents, jewelry, hair products, topical medications, gloves, adhesives, and hobbies.

When allergic contact dermatitis is suspected, patch testing may be useful to identify relevant allergens. Identifying and avoiding the responsible allergen can significantly improve long-term disease control.

7. Clinical Features and Symptoms

The clinical presentation of eczema varies according to the type of eczema, patient's age, duration of disease, anatomical site, and degree of inflammation.

Pruritus

Itching is the hallmark symptom of many eczematous disorders, particularly atopic dermatitis. It may range from mild irritation to severe, persistent itching that interferes with sleep.

Nocturnal itching can be especially troublesome. Patients may scratch unconsciously during sleep, producing excoriations and worsening the inflammatory process.

Dry Skin

Xerosis is extremely common. The skin may appear rough, flaky, cracked, or dull. Severe dryness can lead to painful fissures, particularly on the hands, feet, and areas exposed to repeated friction.

Erythema

Inflamed skin may appear red, although the intensity of erythema varies with skin pigmentation. In darker skin tones, eczema may appear brown, purple, gray, or darker than the surrounding skin rather than bright red.

Papules and Vesicles

Acute eczema may produce small inflammatory papules or vesicles. Vesicular lesions are particularly characteristic of dyshidrotic eczema.

Scaling

Scaling occurs because of abnormal epidermal turnover, dryness, and inflammation. Fine or thick scales may develop depending on the specific type and chronicity of eczema.

Oozing and Crusting

Acute or severely inflamed eczema may become exudative. Serous fluid can dry to form crusts. Yellow crusting, increasing pain, warmth, pus, fever, or rapidly worsening inflammation should raise concern for secondary infection.

Excoriations

Scratching produces linear or irregular erosions and excoriations. These lesions can become entry points for microorganisms and contribute to secondary infection.

Lichenification

Chronic rubbing and scratching cause the skin to become thickened, leathery, and more prominently marked. This is called lichenification and is a characteristic feature of chronic eczema.

Pigmentary Changes

After inflammation resolves, patients may develop post-inflammatory hyperpigmentation or hypopigmentation. These changes can persist considerably longer than the active eczema itself.

Pain and Burning

Although itching is dominant, eczema can also cause burning, tenderness, and pain, particularly when the skin is cracked or secondarily infected.

The combination of these findings can significantly affect physical comfort and quality of life. Persistent disease may interfere with sleep, education, employment, exercise, and social activities.

8. Distribution and Morphology of Lesions

The distribution of eczema provides important diagnostic information. Different forms of eczema tend to involve particular anatomical regions.

In atopic dermatitis, distribution changes with age. Infants commonly have facial involvement, while older children and adults frequently develop lesions in flexural areas such as the elbows and knees. Hands, eyelids, neck, and other sites can also be affected.

Contact dermatitis often follows the area exposed to the responsible irritant or allergen. For example, dermatitis caused by a cosmetic may affect the face, while occupational exposure may primarily affect the hands.

Dyshidrotic eczema predominantly affects the palms, sides of the fingers, and soles, where small, intensely itchy vesicles develop.

Nummular eczema produces well-demarcated, coin-shaped lesions, commonly on the limbs.

Seborrheic dermatitis favors sebaceous areas such as the scalp, eyebrows, central face, and ears.

Stasis dermatitis typically affects the lower legs, particularly in patients with chronic venous insufficiency.

Morphology and distribution should always be interpreted together with the patient's age, history, symptoms, exposures, and disease course because different dermatological conditions can sometimes produce similar-appearing lesions.

9. Complications of Eczema

Eczema is usually manageable with appropriate treatment, but persistent inflammation, scratching, impaired skin-barrier function, and secondary infection can lead to several complications. The risk of complications generally increases when eczema is severe, widespread, poorly controlled, or associated with repeated scratching.

Secondary Bacterial Infection

The disrupted epidermal barrier in eczema makes it easier for bacteria to enter the skin. Staphylococcus aureus is commonly associated with infected eczematous skin. Clinical features suggesting bacterial infection include increasing pain, warmth, swelling, purulent discharge, rapidly worsening inflammation, pustules, and crusting.

More extensive infection may be accompanied by fever or systemic symptoms. Cellulitis can develop when infection spreads into deeper tissues.

Antibiotics are not routinely required for uncomplicated eczema. They should generally be considered when there is clinical evidence of bacterial infection rather than simply because bacteria are present on the skin.

Eczema Herpeticum

Eczema herpeticum is a potentially serious complication caused by infection with herpes simplex virus, occurring on skin affected by eczema. It can develop rapidly and requires prompt medical assessment.

Typical features include clusters of painful, monomorphic vesicles or punched-out erosions developing over areas of eczema. Fever, malaise, and lymphadenopathy may occur.

Because untreated infection can progress rapidly and potentially involve the eyes or other organs, suspected eczema herpeticum requires urgent antiviral treatment and medical evaluation.

Sleep Disturbance

Persistent itching, particularly at night, can significantly disrupt sleep. Patients may repeatedly wake because of itching or unconsciously scratch while sleeping.

Chronic sleep disturbance can result in daytime fatigue, poor concentration, irritability, impaired academic or occupational performance, and reduced quality of life.

Lichenification

Repeated scratching and rubbing cause chronic epidermal thickening and exaggeration of normal skin markings. This process is called lichenification.

Lichenified skin may become increasingly resistant to treatment because the chronic mechanical and inflammatory cycle has altered the structure of the affected skin.

Fissures and Bleeding

Severe dryness and inflammation can cause painful cracks in the skin. Fissures are particularly common on the hands, fingers, heels, and other areas exposed to repeated mechanical stress.

Deep fissures may bleed and can provide additional entry points for microorganisms.

Pigmentary Changes

Inflammation can produce persistent changes in pigmentation. Patients with darker skin may experience particularly noticeable post-inflammatory hyperpigmentation or hypopigmentation.

These changes may remain after active eczema has resolved and can sometimes take months to improve.

Ocular Complications

Patients with eczema, particularly atopic dermatitis, may develop eyelid dermatitis and other ocular problems. Persistent rubbing of the eyes can worsen inflammation.

Patients with eye pain, marked redness, photophobia, visual changes, or other significant ocular symptoms should receive prompt ophthalmological assessment.

Psychosocial Effects

Severe eczema can affect self-confidence, social interaction, education, employment, and relationships. Visible lesions may cause embarrassment or lead patients to avoid social situations.

Chronic itching and sleep loss can further contribute to emotional distress and reduced overall quality of life.

10. Diagnostic Evaluation

The diagnosis of eczema is primarily clinical. A detailed history and careful examination of the skin are usually more useful than routine laboratory investigations.

Clinical History

The clinician should determine:

• Age at onset
• Duration of symptoms
• Pattern of recurrence
• Severity and intensity of itching
• Distribution of lesions
• Previous episodes
• Personal history of atopic diseases
• Family history of eczema or allergic disorders
• Occupational exposures
• Cosmetic and personal-care products
• Medication use
• Exposure to detergents and chemicals
• Seasonal variation
• Possible food-related symptoms
• Previous treatments and their responses

The timing of symptoms in relation to environmental or occupational exposure can provide important diagnostic clues.

Physical Examination

The entire skin surface should be assessed when appropriate. The examination should document:

• Erythema
• Dryness
• Scaling
• Papules
• Vesicles
• Crusting
• Excoriations
• Fissures
• Lichenification
• Pigmentary changes
• Distribution and symmetry
• Evidence of infection

The scalp, face, eyelids, hands, flexures, extensor surfaces, and other characteristic sites should be examined according to the suspected diagnosis.

Severity Assessment

For patients with moderate-to-severe disease, standardized severity instruments can help assess disease activity and monitor treatment response.

Common clinical assessment tools include:

• Eczema Area and Severity Index (EASI)
• SCORing Atopic Dermatitis (SCORAD)
• Investigator's Global Assessment (IGA)
• Body Surface Area (BSA)
• Patient-Oriented Eczema Measure (POEM)

Assessment of sleep disturbance, itching, pain, and quality-of-life impairment is also important because visible skin findings may underestimate the patient's actual disease burden.

Laboratory Investigations

Routine laboratory testing is not necessary for most patients with typical eczema.

Laboratory investigations may be considered when another diagnosis is suspected or when complications are present. Depending on the clinical situation, investigations may include:

• Complete blood count
• Serum IgE
• Microbiological testing
• Viral testing
• Allergy evaluation
• Patch testing

An elevated serum IgE level may occur in atopic dermatitis, but it is neither sufficiently sensitive nor specific to establish the diagnosis by itself.

Skin Biopsy

A skin biopsy is not routinely required for typical eczema. It may be considered when the clinical presentation is atypical or when disorders such as psoriasis, cutaneous lymphoma, autoimmune disease, or other inflammatory dermatoses need to be excluded.

Histopathological findings vary according to whether the eczema is acute, subacute, or chronic.

11. Differential Diagnosis

Several dermatological conditions can resemble eczema. Accurate diagnosis is essential because treatment differs considerably among these disorders.

Psoriasis

Psoriasis commonly produces well-demarcated erythematous plaques covered by silvery scales. Typical sites include the scalp, elbows, knees, and other extensor surfaces.

Compared with eczema, psoriasis often has sharper borders and thicker plaques, although overlap can occur.

Tinea Corporis

Dermatophyte infection may produce annular lesions with a scaly advancing border and relative central clearing. Tinea can be mistaken for nummular eczema.

When fungal infection is suspected, potassium hydroxide examination or other mycological testing may help establish the diagnosis.

Scabies

Scabies produces intense itching, often worse at night. Characteristic burrows may occur in the finger webs, wrists, genital region, waist, and other areas.

Household members may also develop itching, which is an important diagnostic clue.

Seborrheic Dermatitis

Seborrheic dermatitis predominantly affects sebaceous areas and typically produces erythema with fine or greasy scaling. The scalp, eyebrows, nasolabial folds, ears, and central face are commonly involved.

Allergic Contact Dermatitis

Allergic contact dermatitis should be considered when eczema has a specific relationship to exposure to a cosmetic, metal, topical medication, occupational substance, or other allergen.

Patch testing may help identify the responsible allergen.

Irritant Contact Dermatitis

Irritant dermatitis is particularly important in people with frequent exposure to water, detergents, disinfectants, solvents, and other irritants. It commonly affects the hands.

Drug Eruptions

Certain medications can produce widespread inflammatory eruptions that resemble eczema. The medication history and temporal relationship between drug exposure and rash are therefore important.

Cutaneous T-Cell Lymphoma

Persistent, atypical, treatment-resistant eczematous plaques, particularly in adults, may rarely represent cutaneous T-cell lymphoma. Suspicious lesions may require dermatological evaluation and biopsy.

12. Pharmacological Management

Treatment is individualized according to the type of eczema, severity, anatomical location, age, disease duration, complications, and previous treatment response.

The major goals are to reduce inflammation, relieve itching, restore the skin barrier, treat infection when present, prevent flares, and maintain long-term disease control.

Topical Corticosteroids

Topical corticosteroids remain an important treatment for inflammatory eczema. They reduce inflammation, erythema, itching, and other manifestations of active disease.

Different corticosteroids have different potencies. Low-potency preparations are generally preferred for sensitive areas such as the face and skin folds, whereas stronger preparations may be used for thick plaques or severe disease for limited periods under appropriate medical supervision.

Prolonged inappropriate use of potent corticosteroids can cause adverse effects including:

• Skin atrophy
• Telangiectasia
• Striae
• Easy bruising
• Steroid acne
• Perioral dermatitis
• Changes in pigmentation

Therefore, potency, duration, body site, and patient age must be considered carefully.

Topical Calcineurin Inhibitors

Tacrolimus and pimecrolimus are non-steroidal anti-inflammatory treatments used particularly for sensitive sites such as the face, eyelids, and skin folds.

They can also be useful for maintenance therapy and for reducing repeated exposure to topical corticosteroids in appropriate patients.

Transient burning or stinging may occur after application, particularly during the initial phase of treatment.

Topical PDE-4 Inhibitors

Phosphodiesterase-4 inhibitors can reduce inflammatory signaling in the skin and are available as non-steroidal topical treatments for selected patients.

They may be useful when corticosteroid-sparing treatment is desired.

Topical JAK Inhibitors

Topical Janus kinase inhibitors provide another non-steroidal treatment option for selected patients with atopic dermatitis. They act on intracellular signaling pathways involved in inflammatory cytokine activity.

Their use depends on the specific medication, patient's age, disease severity, affected body sites, and local prescribing recommendations.

Antihistamines

Antihistamines are sometimes used when itching is associated with urticaria or another histamine-mediated condition. However, conventional antihistamines do not directly treat the underlying inflammation of atopic dermatitis.

Sedating antihistamines may occasionally be used under medical supervision when nighttime itching severely interferes with sleep, but routine use solely for atopic dermatitis is not generally considered a primary anti-inflammatory treatment.

Systemic Corticosteroids

Systemic corticosteroids can rapidly suppress inflammation but are generally avoided as routine long-term therapy for atopic dermatitis because of significant adverse effects and the risk of rebound disease after discontinuation.

They may occasionally be used in exceptional circumstances under specialist supervision.

Biologic Therapy

Patients with moderate-to-severe atopic dermatitis who do not achieve adequate control with topical therapy may be candidates for biologic treatment.

Examples include agents targeting specific inflammatory pathways such as:

• Dupilumab
• Tralokinumab
• Lebrikizumab

These medicines selectively interfere with pathways involved in type 2 inflammation and have changed the treatment landscape for moderate-to-severe atopic dermatitis.

Janus Kinase Inhibitors

Systemic JAK inhibitors can provide rapid and substantial improvement in selected patients with moderate-to-severe atopic dermatitis.

Examples include:

• Upadacitinib
• Abrocitinib

Because systemic JAK inhibitors can have important safety considerations, including infections, laboratory abnormalities, thromboembolic and cardiovascular risks in appropriate populations, treatment requires careful patient selection and monitoring.

Current treatment guidelines emphasize selecting systemic therapies according to disease severity, patient characteristics, comorbidities, safety considerations, and treatment goals.

Treatment of Secondary Infection

When bacterial infection is clinically evident, appropriate antimicrobial therapy may be required. Viral infections such as eczema herpeticum require antiviral treatment.

Routine antibiotic treatment of uncomplicated eczema is not recommended because it does not address the underlying inflammatory disease and may contribute to antimicrobial resistance.

13. Non-Pharmacological Management and Skin Care

Skin care is a fundamental part of eczema management. Even when medication successfully suppresses inflammation, inadequate barrier care can allow dryness and irritation to recur.

Regular Moisturization

Frequent application of moisturizers helps reduce dryness and supports the epidermal barrier. Moisturizers may contain occlusive, humectant, or emollient ingredients.

Examples include:

• Petrolatum-based products
• Ceramide-containing moisturizers
• Glycerin-containing preparations
• Fragrance-free creams
• Ointments for very dry skin

Moisturizers should generally be applied regularly and particularly after bathing while the skin is still slightly damp.

Bathing Practices

Patients should avoid very hot water because excessive heat can worsen dryness and itching.

Recommended practices include:

• Use lukewarm water.
• Keep baths and showers relatively brief.
• Use gentle fragrance-free cleansers.
• Avoid aggressive scrubbing.
• Pat the skin dry rather than rubbing it vigorously.
• Apply moisturizer soon after bathing.

Clothing

Soft, breathable fabrics are generally better tolerated than rough materials. Wool and other irritating fabrics may aggravate symptoms in susceptible individuals.

Loose-fitting clothing can reduce friction and overheating.

Environmental Control

Extremes of temperature and humidity may worsen symptoms. Maintaining a comfortable indoor environment and avoiding excessive heat and sweating can help some patients.

Trigger Avoidance

Patients should identify their individual triggers rather than unnecessarily eliminating large numbers of foods or environmental exposures.

Potential triggers may include:

• Fragrances
• Harsh detergents
• Certain cosmetics
• Occupational chemicals
• Excessive sweating
• Rough fabrics
• Very dry environments
• Specific allergens in patients with documented sensitization

Wet-Wrap Therapy

Wet-wrap therapy can sometimes be used for severe flares under appropriate medical guidance. Moisturizer, and when prescribed, topical medication, is applied to the affected skin followed by a damp layer of clothing or bandaging and then a dry layer.

This can increase hydration and enhance penetration of topical treatments. Because prolonged occlusion can increase medication absorption and potentially increase adverse effects, appropriate supervision is important.

14. Prevention and Patient Education

Although eczema cannot always be prevented, appropriate skin care and trigger management can reduce the frequency and severity of flares.

Patients should understand that eczema is often a chronic, relapsing condition. Improvement does not necessarily mean that the underlying tendency has permanently disappeared.

Patient Education

Education should cover:

• Correct use of prescribed medications
• Appropriate corticosteroid potency and application
• Regular moisturizer use
• Recognition of early flare symptoms
• Trigger identification
• Avoidance of excessive scratching
• Recognition of infection
• Importance of follow-up when disease is poorly controlled

Patients should also understand that topical corticosteroids, when correctly selected and used according to medical instructions, are effective treatments. Fear of corticosteroids can sometimes lead to undertreatment and persistent inflammation.

Nail Care

Keeping fingernails short can reduce skin damage caused by scratching. This is particularly helpful in children who may scratch intensely during sleep.

Early Treatment of Flares

Early treatment of an inflammatory flare can help prevent progression to extensive disease and reduce prolonged scratching.

Some patients benefit from proactive intermittent anti-inflammatory treatment on previously affected areas after the acute flare has resolved, particularly when prescribed by a clinician for recurrent disease.

15. Prognosis and Long-Term Management

The prognosis of eczema varies considerably between individuals. Many children with atopic dermatitis experience substantial improvement as they grow older, whereas others continue to have recurrent disease throughout adolescence and adulthood.

The course is influenced by disease severity, age of onset, genetic predisposition, environmental exposures, associated atopic disease, adherence to treatment, and individual response to therapy.

Long-term management focuses on maintaining the skin barrier, controlling inflammation, preventing recurrent flares, identifying relevant triggers, and treating complications promptly.

Patients with mild disease may achieve excellent control with regular moisturization and intermittent topical anti-inflammatory therapy. Those with moderate-to-severe disease may require more intensive treatment, including phototherapy, biologic therapy, or systemic immunomodulatory treatment.

Follow-up is particularly important when eczema is widespread, frequently recurrent, significantly affecting sleep or quality of life, associated with recurrent infection, or inadequately controlled with standard topical therapy.

The overall objective of long-term management is not simply to make visible lesions disappear temporarily, but to establish sustained disease control, minimize treatment-related adverse effects, protect the skin barrier, reduce flare frequency, and maintain quality of life.