Acne vulgaris - most commonly experienced around puberty, typically of the face and shoulders/chest

Acne keloidalis nuchae (Pseudofolliculitis nuchae) - a rash caused by shaving

Acne fulminans - an extreme form of acne conglobata

Acne medicamentosa - acne caused by starting or stopping a medicine

Acne cosmetica - acne caused by cosmetics

Cystic acne, a severe form of acne wherein small cysts form.

Acne conglobata (Hidradenitis suppurativa) - chronic abscesses or boils of sweat glands and hair follicles; in the underarms, groin and buttocks, and under the breasts in women

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