Atopic Dermatitis

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What Is Atopic Dermatitis?

Atopic dermatitis (AD) is a chronic inflammatory skin disease characterized by intense itching, dryness, and recurrent eczema. It often begins in childhood but can develop or persist at any age.

The disease follows a relapsing course, with periods of relative control and flares. Atopic dermatitis is not contagious and may affect sleep, school, work, mental health, and quality of life.

What Causes Atopic Dermatitis?

Atopic dermatitis results from a combination of skin-barrier impairment, immune dysregulation, genetic susceptibility, and environmental influences. Reduced barrier function allows moisture loss and increases penetration of irritants, allergens, and microbes.

Flares may be worsened by dry weather, heat, sweating, fragrances, harsh cleansers, certain fabrics, stress, infection, and scratching. Food allergy can coexist, especially in young children with severe disease, but is not the usual cause of eczema.

Diagnosis

Diagnosis is based on typical itching, rash appearance, distribution, chronic or relapsing history, and associated atopic features. There is no single diagnostic blood test; patch testing or other studies may be used when contact allergy, infection, or another skin disorder is suspected.

Treatment Options

Foundational treatment includes daily moisturization, gentle bathing, trigger reduction, and topical anti-inflammatory therapy such as corticosteroids, calcineurin inhibitors, or other nonsteroidal agents. Wet-wrap therapy and phototherapy may help selected patients.

Moderate-to-severe disease may require biologic medicines or oral targeted immune therapies. Treatment plans should include maintenance therapy, flare instructions, infection management, and monitoring for medication effects.

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Living With Atopic Dermatitis

Apply a fragrance-free moisturizer at least daily and soon after bathing. Use lukewarm water, mild cleansers only where needed, breathable clothing, and prescribed anti-inflammatory treatment early in a flare.

Sleep disruption and scratching can create a self-reinforcing cycle. Keeping nails short, using cool compresses, treating nighttime itch appropriately, and addressing stress or anxiety may reduce skin damage.

When to Seek Emergency Care

Seek urgent medical attention for rapidly spreading painful skin, fever, clusters of uniform blisters, punched-out erosions, eye involvement, extensive pus or crusting, or marked swelling. These signs may indicate eczema herpeticum or a serious bacterial infection.

Prognosis

Atopic dermatitis can often be controlled but may require long-term maintenance. Many children improve with age, while some continue to have disease into adulthood or develop hand, facial, or occupational eczema.

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Risks

Risk factors include a personal or family history of atopic dermatitis, asthma, or allergic rhinitis; filaggrin and other skin-barrier gene variants; dry or sensitive skin; urban or polluted environments; and frequent exposure to irritants. Complications include bacterial or viral skin infection, sleep loss, anxiety or depression, eye disease, contact allergy, and adverse effects from inappropriate treatment.

Symptoms

Symptoms include intense itching, dry and sensitive skin, red or discolored patches, scaling, cracks, small bumps, oozing or crusting during flares, and thickened skin from chronic scratching. Distribution varies with age and may involve the face, neck, hands, wrists, ankles, and folds of the elbows and knees.

Diagnosis

A healthcare professional diagnoses atopic dermatitis by reviewing itch, age at onset, flare pattern, family history, triggers, treatment response, and the characteristic distribution of eczema. Examination also looks for infection, lichenification, eye involvement, and other atopic conditions.

Allergy blood tests are not routinely required and cannot by themselves diagnose the condition. Patch testing may identify coexisting allergic contact dermatitis, while swabs, skin scraping, or biopsy are reserved for suspected infection or an alternative diagnosis.