What is the IGA scale for acne?

IGA 0: clear skin. 1: almost clear (few scattered comedones/small papules). 2: mild (some comedones and papules). 3: moderate (many comedones, papules, pustules; no nodules). 4: severe (extensive inflammatory lesions, nodules, potential scarring).

When is isotretinoin indicated?

Isotretinoin is indicated for: severe nodular/cystic acne (IGA 4), moderate acne not responding to antibiotics + topicals for 3+ months, acne causing scarring, and acne with significant psychological impact regardless of severity.

What are the treatment guidelines for moderate acne?

IGA 3 moderate acne: topical retinoid + topical antibiotic (clindamycin or erythromycin) +/- benzoyl peroxide. Add oral doxycycline/sarecycline for inflammatory acne. Limit oral antibiotics to 3 months with BPO to prevent resistance.

Acne Vulgaris IGA 0-4 Classification

Grade acne vulgaris severity using IGA 0-4: 0 (clear), 1 (almost clear), 2 (mild: few comedones/papules), 3 (moderate: many lesions), 4 (severe: extensive inflammatory lesions/nodules).

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Frequently Asked Questions

What is the IGA scale for acne?

When is isotretinoin indicated?

What are the treatment guidelines for moderate acne?