Table 1.

Investigator's assessment scale (IGA) for acne severity combined with post-inflammatory hyperpigmentation severity.

	Definition	Grade	Number of papules and pustules (half of the face)	Pigmentary intensity of hyperpigmented lesions	Area of hyperpigmented lesions (% facial area)
Clear or almost clear	Residual hyperpigmentation and erythema may be present. A few scattered comedones and a few small papules.	0	<10	None or trace	0–10%
Mild	Easily recognizable; less than half the face is involved. Some comedones and some papules/pustules.	1 2 3	10–25 26–50 51–75	Mild (localized)	11–25%
Moderate	More than half of the face is involved. Many comedones, papules/pustules. One nodule may be present.	4 5 6	76–100 >100 With 0 or 1 nodules or cysts	Moderate (diffused)	26–50%
Severe	Entire face is involved. Covered with comedones, papules/pustules. Presence of nodules/cysts.	7	With 2–4 nodules or cysts	Severe (prominent)	>50%