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From aad.org, a report on dermatology and blisters and health clubs and exercise:

Regular exercisers also may be susceptible to acne mechanica, a form of acne that can occur under athletic equipment or tight-fitting clothing. Acne mechanica typically develops in warm, moist environments — especially areas prone to friction. Wearing tight-fitting exercise shorts made of non-breathable fabrics can even cause an acne flare-up on the buttocks. “Changing your workout attire by eliminating tight-fighting clothing and adding more breathable, moisture-wicking fabrics can help prevent acne mechanica,” said Dr. Adams. “If these preventive measures are not working, your dermatologist can prescribe prescription medications that are effective in treating this type of acne.”