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EASI Score & Atopic Dermatitis Severity

The Eczema Area and Severity Index (EASI) quantifies atopic dermatitis severity across 4 body regions and 4 clinical signs. It guides treatment decisions and tracks response to therapy.

Calculate Your EASI ScoreUse the calculator below to check your health metrics

Why This Health Metric Matters

Why: EASI is the gold standard for measuring eczema severity in clinical trials and practice. It guides escalation from topical to systemic therapy.

How: Each body region is scored for erythema, edema, excoriation, and lichenification (0-3) plus area involved (0-6). Regional scores are weighted by body surface area.

  • ●EASI-75 is primary endpoint in biologic trials
  • ●Score >21 indicates systemic therapy
  • ●Maximum possible score is 72
Sources:Hanifin & Rajka

Sample Patient Scenarios

✅ Clear/Minimal

Well-controlled eczema, minimal signs

📊 Mild Eczema

Limited involvement, topical responsive

⚠️ Moderate Eczema

Broader involvement, consider escalation

🔴 Severe Eczema

Extensive disease requiring systemic therapy

🚨 Very Severe Eczema

Widespread, poorly controlled, urgent treatment needed

💉 Biologic Candidate

Severe disease eligible for biologic therapy

👶 Pediatric AD

Child with moderate atopic dermatitis

Head and Neck (×0.1)

Upper Extremities (×0.2)

Trunk (×0.3)

Lower Extremities (×0.4)

Quality of Life & Symptoms

⚠️For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.

🏥 Health Facts

📊

EASI evaluates 4 signs: erythema, edema, excoriation, lichenification

— Dermatology guidelines

🎯

EASI-75 response indicates 75% reduction from baseline

— Clinical trials

Understanding EASI

The Eczema Area and Severity Index (EASI) is a validated clinician-assessed measure used to quantify the severity of atopic dermatitis. It evaluates 4 body regions for 4 signs of inflammation plus affected area.

4 Clinical Signs Assessed

  • • Erythema - Redness
  • • Edema/Papulation - Swelling
  • • Excoriation - Scratch marks
  • • Lichenification - Skin thickening

4 Body Regions

  • • Head/Neck (10% BSA) - ×0.1
  • • Upper Extremities (20% BSA) - ×0.2
  • • Trunk (30% BSA) - ×0.3
  • • Lower Extremities (40% BSA) - ×0.4

EASI Severity Categories

0-1
Clear/Almost Clear
Maintenance therapy, moisturizers only
1.1-7
Mild
Topical therapy (TCS, TCI), emollients
7.1-21
Moderate
Topical therapy, consider phototherapy or systemic
21.1-50
Severe
Systemic therapy indicated (biologics, JAKi)
>50
Very Severe
Urgent systemic therapy, specialist care

Treatment Response Endpoints

EASI-50
50% Reduction
Minimum clinically meaningful response
EASI-75
75% Reduction
Primary efficacy endpoint in clinical trials
EASI-90
90% Reduction
Near complete clearance
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