Acne may affect any age group, but it is most common in adolescents.
Lesions consist of noninflammatory comedones (whiteheads and blackheads) and inflammatory papules, pustules, nodules, and cysts.
Severity ranges from mild comedonal acne to severe nodulocystic acne, which can be permanently disfiguring.
Systemic effects may also be present with acne fulminans, a rare variant.
Treatments include topical retinoids, keratolytics, and antibiotics; more severe inflammatory lesions may require oral antibiotics; severe nodulocystic acne may require oral isotretinoin.
Typical appearance of acne
University of Michigan Department of Dermatology
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