Drugs and Industrial chemicals. Acne-like conditions may also result from the use of certain drugs, primarily bromides, iodides, corticosteroids, androgens, and drugs used to treat epilepsy. Industrial substances, including coal tar and petroleum oil, may also cause severe cases of acne. Pressure on the skin from clothing, backpacks, football shoulder pads, headbands, sport masks and helmets can aggravate acne by friction. Similarly, careless resting of the chin or cheek on a hand while doing homework or talking on the telephone can also cause a breakout of acne.
Excessive perspiration can also result in acne.
Other causes of acne are more obvious. Cosmetics containing oils or waxy substances are prone to cause acne or aggravate a pre-existing condition. Products labeled or advertised as water-based should be carefully scrutinized before purchase. Likewise, water-based sunscreens that are primarily alcohol are usually a better choice than tanning oils, creams, or lotions. Mascara, lipstick, and lip glosses are generally safe.