TABLE 1.

EDF and IGA acne classification

SEVERITY	EDF CLASSIFICATION DESCRIPTION	IGA CLASSIFICATION DESCRIPTION
Grade 0	NA	Clear; residual hyperpigmentation and erythema may be present
Grade 1	Comedonal acne	Almost clear; a few scattered comedones and a few scattered papules
Grade 2	Mild to moderate papulopustular acne	Mild; easily recognizable; less than half the face is involved; some comedones and some papules and pustules may be visible
Grade 3	Severe papulopustular acne, moderate nodular acne	Moderate; more than half the face is involved; many comedones, papules and pustules are visible and one nodule may be present
Grade 4	Severe nodular acne, conglobate acne	Severe; the entire face is involved, covered with comedones, papules, and pustules; a few nodules and cysts are observed

EDF: European Dermatology Forum; IGA: Investigator Global Assessment