In 1990, the American Academy of Dermatology developed a classification scheme for primary acne vulgaris.7 This grading scale delineates three levels of acne: mild, moderate, and severe. Mild acne is characterized by the presence of few to several papules and pustules, but no nodules. Patients with moderate acne have several to many papules and pustules, along with a few to several nodules. With severe acne, patients have numerous or extensive papules and pustules, as well as many nodules. Acne also is classified by type of lesion— comedonal, papulopustular, and nodulocystic. Pustules and cysts are considered inflammatory acne.
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