Table 1.

Investigator’s Global Assessment Scale of Acne Severity^11–13

Acne Severity Scale	Type of Lesions
0 Clear skin	No inflammatory and non-inflammatory lesions
1 The skin is almost unchanged	Few comedones and ≤ 1 small inflammatory lesion
2 Mild severity	A dozen comedones, ≤ several inflammatory lesions
3 Moderate severity	Many comedones, > several inflammatory lesions, ≤ 1 nodule
4 Severe severity	Many comedones and inflammatory lesions, ≤ several nodules and cysts