TABLE 2.

Comprehensive Acne Severity Scale (CASS)

GRADE		DESCRIPTION
Clear	0	No lesions to barely noticeable ones; very few scattered comedones and papules
Almost clear	1	Hardly visible from 2.5 meters away; a few scattered comedones and a few small papules; and very few pustules, comedones, and papules
Mild	2	Easily recognizable; less than half of the affected area is involved; many comedones, papules, and pustules
Moderate	3	More than half of the affected area is involved; numerous comedones, papules, and pustules
Severe	4	Entire area is involved; covered with comedones, numerous pustules and papules, a few nodules and cysts
Very severe	5	Highly inflammatory acne covering the affected area, nodules and cysts present
Reproduced with permission from Dr. Jerry Tan19