The tendency to develop acne runs in families. You are more likely to develop severe acne if your parents had severe acne.

The risk of developing acne is highest during the teen and young adult years. These are the years when hormones such as testosterone are increasing. Women who are at the age of menstruation also are more likely to develop acne. Many women have acne flare-ups in the days just before their menstrual periods.

Acne can be irritated or made worse by:

• Wearing straps or other tight-fitting items that rub against the skin (such as a football player wearing shoulder pads), as well as using equipment that rubs against the body (such as a violin held between the cheek and shoulder). Helmets, bra straps, headbands, and turtleneck sweaters also may cause acne to get worse.
• Using skin and hair care products that contain irritating substances.
• Washing the face too often or scrubbing the face too hard. Using harsh soaps or very hot water can also cause acne to get worse.
• Experiencing a lot of stress.
• Touching the face a lot.
• Sweating a lot.
• Having hair hanging in the face, which can cause the skin to be oilier.
• Taking certain medications.
• Working with oils and harsh chemicals on a regular basis.