Moderate vs. Severe Inflammatory Acne: Lesion Counts & Locations

Acne severity grading guides treatment. Inflammatory lesions = papules, pustules, nodules, cysts.

Moderate Inflammatory Acne

• Face: >10 inflammatory lesions
• Back/Chest: >5 inflammatory lesions
• Mix of papules and pustules; few nodules
• Limited scarring risk

Severe Inflammatory Acne

• Face: >20 inflammatory lesions
• Back/Chest: >10 inflammatory lesions
• Numerous deep, painful nodules and cysts
• High scarring risk
• May have systemic symptoms (fever, malaise = acne fulminans)

Clinical Implications

• Moderate: Topical retinoid + antimicrobial (benzoyl peroxide/clindamycin) ± oral antibiotic
• Severe: Often requires oral isotretinoin; early referral to dermatologist
• Nodulocystic: Intralesional steroids for painful cysts

Additional Grading Systems

• IGA (Investigator's Global Assessment): 1–4 scale
• Leeds revised acne grading: photographic standards
• FDA endpoints: lesion counts + IGA

Accurate grading ensures appropriate therapy and monitors response.