Acne is a group of skin rashes that have different causes.

• Acne vulgaris - most commonly experienced around puberty, typically of the face and shoulders/chest
• Cystic acne, a severe form of acne wherein small cysts form
• Acne rosacea - a red rash predominantly on the face
• Pseudofolliculitis barbae (Acne keloidalis nuchae), a rash caused by shaving
• Hidradenitis suppurativa (Acne conglobata) - chronic abscesses or boils of sweat glands and hair follicles; in the underarms, groin and buttocks, and under the breasts in women
• Acne cosmetica - acne caused by cosmetics
• Acne fulminans - an extreme form of acne conglobata
• Acne medicamentosa - acne caused by starting or stopping a medicine
• Baby acne - a rash seen on the cheeks, chin, and forehead of infants
• Chloracne - an acne rash caused by exposure to chlorinated hydrocarbons such as dioxins or PCBs

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