Acne is mostly caused by bacteria, sebum, and dead skin cells that become caught in hair follicles and block pores. It causes inflammation in the legs and is essentially a physical problem. It is usually caused by sporting equipment rubbing against your skin, as well as too-tight clothing or underwear.

But use caution. Acne on the legs is sometimes confused with other illnesses such as folliculitis, eczema, or keratosis pilaris. If it is irritating and unpleasant, it is best to see a doctor and receive professional treatment.