Eczema (Atopic Dermatitis): A Physician's Complete Guide

In my practice, one of the most common misconceptions I encounter is that eczema is "just dry skin" or a minor cosmetic issue. It is neither. Atopic dermatitis — the most common form of eczema — is a complex, chronic inflammatory disease driven by immune dysregulation and structural defects in the skin barrier. It affects over 31 million Americans, roughly 10% of the population, and its impact extends far beyond what's visible on the surface.^[2]

The area of eczema treatment has been transformed over the past several years. When I started training, the options for severe eczema were limited to potent topical steroids, immunosuppressants with significant side effects, and a lot of reassurance that it "might get better with age." Today, we have an expanding arsenal of targeted biologics, JAK inhibitors, and novel non-steroidal topicals that can achieve clear or nearly clear skin for patients who previously had no good options. The 2025 AAD focused guideline update added four new recommended therapies in a single revision — an unprecedented pace of change in dermatology.^[1]

This guide reflects the latest evidence and clinical guidelines, combined with what I've learned treating patients across the eczema severity spectrum. My goal is to help you understand what's happening in your skin, what your treatment options are in 2026, and when you need to escalate care.

What Causes Eczema? The Science Behind the Itch

Atopic dermatitis is not caused by a single factor. It results from a convergence of three interrelated problems: a defective skin barrier, an overactive immune system, and environmental triggers that exploit both vulnerabilities.

Skin Barrier Dysfunction: The Foundation

Healthy skin functions as a brick-and-mortar wall. The "bricks" are skin cells (corneocytes) and the "mortar" is a matrix of lipids — primarily ceramides, cholesterol, and fatty acids — that holds them together and prevents water from escaping. In atopic dermatitis, this barrier is structurally compromised.

The most significant genetic discovery in eczema research was the identification of loss-of-function mutations in the filaggrin gene (FLG). Filaggrin is a structural protein essential for building the outermost layer of skin and generating natural moisturizing factors. These mutations are carried by up to 10% of the general population and are present in up to 50% of individuals with moderate-to-severe atopic dermatitis.^[3] When filaggrin is deficient, the skin barrier becomes permeable — water escapes (leading to the characteristic dryness), and allergens, irritants, and microbes penetrate inward, triggering inflammatory cascades.

I explain it to my patients this way: imagine your skin is a raincoat with holes in it. Water gets out, and everything in the environment gets in. No amount of willpower or hygiene can fix a raincoat with structural defects — you need to patch the holes and protect the coat.

Immune Dysregulation: The Inflammatory Engine

The immune abnormality in atopic dermatitis is predominantly a Type 2 inflammatory response — the same pathway involved in asthma, allergic rhinitis, and food allergies. That's why these conditions frequently co-occur (the "atopic march"). Key inflammatory mediators include:

• Interleukin-4 (IL-4) and IL-13: Drive the Th2 immune response, suppress barrier protein production, and promote IgE production. These are the targets of dupilumab.
• Interleukin-31 (IL-31): The primary cytokine responsible for the intense pruritus (itching) in eczema. This amounts to the target of nemolizumab, approved in December 2024.^[6]
• Interleukin-13: Individually targeted by tralokinumab and lebrikizumab.
• JAK-STAT signaling: An intracellular pathway that amplifies inflammatory signals from multiple cytokines simultaneously. Targeted by JAK inhibitors (upadacitinib, abrocitinib, baricitinib, ruxolitinib).

Environmental Triggers

Even in genetically predisposed individuals, flares are often triggered by identifiable environmental factors:

• Irritants: Soaps, detergents, fragrances, wool, synthetic fabrics, and solvents
• Allergens: Dust mites, pet dander, pollen, mold
• Climate: Low humidity, cold weather, rapid temperature changes, excessive sweating
• Microbial colonization: Staphylococcus aureus colonizes the skin of up to 90% of eczema patients, perpetuating inflammation
• Stress: Psychological stress is a well-documented flare trigger, mediated through neuroimmune pathways
• Hormonal fluctuations: Menstrual cycles, pregnancy, and perimenopause can all influence disease activity

Types of Eczema and How We Grade Severity

"Eczema" is actually an umbrella term encompassing several distinct conditions. Atopic dermatitis is the most common, but other forms include contact dermatitis (allergic or irritant), nummular eczema (coin-shaped patches), dyshidrotic eczema (small blisters on hands and feet), seborrheic dermatitis, and stasis dermatitis. This guide focuses primarily on atopic dermatitis, which accounts for the majority of eczema cases and has seen the most significant treatment advances.

How Dermatologists Assess Severity

In clinical practice and research, we use validated scoring systems to objectively measure disease severity. The most widely used is the Eczema Area and Severity Index (EASI), which evaluates four signs — redness, thickness, scratching, and lichenification — across four body regions, weighted by affected body surface area.^[4]

Severity grading matters because it directly guides treatment decisions. Mild eczema is typically managed with topical therapies alone. Moderate-to-severe disease — particularly when it fails to respond to topicals — is where biologics and JAK inhibitors become appropriate. I tell my patients that severity isn't just about how much skin is affected; it's about how much the disease affects your life, your sleep, and your mental health.

What's Changed: The 2025 AAD Guideline Updates

The American Academy of Dermatology released a focused update in 2025 that represents the most significant single expansion of recommended eczema therapies in the guideline's history. This update brings the previously published 2023–2024 guidelines current with four newly recommended agents.^[1]

What makes this update particularly important for patients is the breadth of options. For the first time, we have targeted therapies at every rung of the treatment ladder — non-steroidal topicals for mild disease, multiple biologic mechanisms for moderate-to-severe disease, and both oral and topical JAK inhibitor options. The era of "try steroids and hope for the best" is definitively over.

Decision Framework: Manage at Home, See a Doctor, or Go to the ER

One of the most valuable things I can offer patients is a clear framework for when self-management is appropriate, when to schedule a medical visit, and when to seek urgent care. Eczema is a chronic condition that requires ongoing management, but certain situations demand prompt medical attention.

What I tell my patients is this: if your eczema is controlling your life rather than the other way around — disrupting sleep, limiting activities, causing emotional distress — that alone is reason enough to escalate care. You don't need to wait until it's "bad enough" on a clinical scale. Quality-of-life impact is a valid and important treatment indication.

Clinical Reasoning: What Your Doctor Evaluates

When a patient presents with a suspected eczema flare, I'm running through a systematic evaluation that may not be obvious. Understanding this process helps explain why we ask the questions we do and why eczema is sometimes misdiagnosed.

Confirming the Diagnosis

Atopic dermatitis is a clinical diagnosis — there is no single blood test or biopsy that definitively confirms it. We use established criteria that include:

• Pruritus (itch): This is essentially required — if it doesn't itch, it's probably not eczema
• Typical morphology and distribution: Flexural involvement (elbows, knees, neck) in older children and adults; facial and extensor involvement in infants
• Chronic or relapsing course: Eczema waxes and wanes over months to years
• Personal or family history of atopy: Asthma, allergic rhinitis, food allergies
• Early age of onset: Most cases begin before age 5

When to Suspect Something Else

Several conditions can mimic atopic dermatitis, and a misdiagnosis means the wrong treatment:

• Contact dermatitis: Pattern follows exposure to a specific allergen or irritant (watch bands, nickel, cosmetics)
• Psoriasis: Well-demarcated, silvery-scaled plaques, often on extensor surfaces and scalp
• Seborrheic dermatitis: Greasy, yellowish scales on the scalp, face, and chest
• Scabies: Intense itch, often worse at night, with burrow tracks; ask about close contacts with similar symptoms
• Cutaneous T-cell lymphoma (mycosis fungoides): Persistent, treatment-resistant patches in an older adult — requires biopsy
• Nutritional deficiencies: Zinc or essential fatty acid deficiency can produce eczema-like rashes

In my practice, the red flags that make me look beyond standard atopic dermatitis include: onset after age 50 with no prior atopic history, failure to respond to appropriate therapy, unusual distribution patterns, and associated systemic symptoms like weight loss or persistent lymphadenopathy.

Treatment Options: The Step-Up Ladder

Modern eczema management follows a step-up approach — starting with foundational care and escalating based on severity and response. The 2025 AAD guidelines provide strong evidence-based recommendations at every level.^[1]

Step 1: Foundational Care (All Patients)

Moisturizers are the central part of eczema management at every severity level. I cannot overstate this. Even patients on biologics need consistent moisturizing. The ideal approach:

• Apply a thick, fragrance-free emollient within 3 minutes of bathing ("soak and seal")
• Ointments (petroleum jelly) provide the best barrier; creams are more cosmetically elegant; lotions are least effective
• Ceramide-containing moisturizers help restore the deficient lipid barrier
• Apply liberally at least twice daily, and more often during flares

Bathing practices matter more than most patients realize. I recommend lukewarm (not hot) baths or showers, limited to 10–15 minutes, using a gentle, fragrance-free cleanser only where needed (not full-body soaping), followed by immediate moisturizer application.

Step 2: Topical Anti-Inflammatory Therapies

Step 3: Phototherapy

Narrowband UVB phototherapy is conditionally recommended by the AAD for moderate-to-severe eczema that doesn't respond adequately to topical therapies. It works by suppressing the inflammatory immune response in the skin. Typically administered 2–3 times per week in a clinic setting, it can be highly effective but requires a significant time commitment. Home phototherapy units are an option for some patients.

Step 4: Systemic Therapies — Biologics and JAK Inhibitors

This is where the treatment space has been transformd. For patients with moderate-to-severe atopic dermatitis who have failed topical therapies, we now have multiple targeted systemic options:

A critical note about systemic corticosteroids: while oral prednisone can provide dramatic short-term relief, the AAD explicitly recommends against its use for eczema management. The rebound flare that occurs when steroids are discontinued is often worse than the original presentation, and the long-term side effects — osteoporosis, adrenal suppression, metabolic syndrome — are unacceptable for a chronic disease.^[1]

Living with Eczema: Beyond Medications

Trigger Avoidance

Identifying and minimizing your personal triggers is as important as any medication. In my practice, I ask patients to keep a simple flare diary for 4–6 weeks, noting activities, products, foods, stress levels, and environmental conditions surrounding each flare. Common actionable triggers include:

• Switching to fragrance-free, dye-free laundry detergent and personal care products
• Wearing soft, breathable cotton clothing next to the skin (avoiding wool and synthetic fabrics)
• Maintaining indoor humidity at 40–60% (using a humidifier in dry climates or during winter)
• Dust mite reduction strategies: allergen-proof mattress and pillow covers, washing bedding weekly in hot water
• Keeping nails short to reduce damage from scratching

Bathing Best Practices

The "soak and seal" method is one of the most effective self-care strategies:

1. Bathe in lukewarm water (not hot) for 10–15 minutes
2. Use a gentle, fragrance-free cleanser only on areas that need it — not a full-body lather
3. Pat skin gently with a towel — do not rub
4. Within 3 minutes (while skin is still damp), apply a thick layer of moisturizer to lock in hydration
5. Apply any prescribed topical medications before moisturizer on affected areas

Mental Health: The Hidden Burden

This is an aspect of eczema care that, frankly, the medical community has underemphasized for too long. The data are striking: adults with atopic dermatitis are 14–20% more likely to experience depression compared to those without the condition. Psychiatric comorbidities — including depression, anxiety, and suicidal ideation — are elevated even in patients with clinically mild or moderate disease.^[5]

The mechanisms connecting skin inflammation to mental health are becoming clearer. The unrelenting itch disrupts sleep — people with eczema are 2–4 times more likely to experience sleep disturbances. Poor sleep is itself a risk factor for depression, anxiety, and in children, behaviors associated with ADHD. Recent research suggests that systemic Type 2 inflammation may contribute to neuroinflammation, potentially affecting cognition and mood directly.^[5]

Emerging evidence is encouraging: a 2025 retrospective study found that patients on dupilumab were 24% less likely to develop anxiety and 30% less likely to develop depression compared to those on conventional therapies over a three-year period. In children, dupilumab was associated with a 44% reduction in new psychiatric diagnoses over two years.^[5]

In my practice, I screen every eczema patient for sleep disturbance, mood changes, and quality-of-life impact. I tell patients that seeking help for the emotional toll of eczema is not a sign of weakness — it's a recognition that this disease affects the whole person, not just the skin.

Red Flags: When to Seek Urgent Care

Eczema herpeticum deserves special emphasis because it is the most dangerous complication specific to eczema patients. When herpes simplex virus infects eczematous skin, it can spread rapidly across large areas. In children, infants, and immunocompromised patients, it can be life-threatening. The hallmark is painful, "punched-out" erosions that look different from a typical eczema flare — and the patient often feels systemically unwell. Early treatment with acyclovir or valacyclovir is essential, and severe cases require hospitalization for IV antiviral therapy.^[7]

Bacterial superinfection with Staphylococcus aureus is extremely common in eczema. Mild impetigo (small areas of crusting) can often be treated with topical mupirocin. However, widespread infection, cellulitis, or systemic symptoms require oral antibiotics and prompt medical evaluation.

Frequently Asked Questions