"Pimples during the teen years are primarily due to the huge surge in hormones during puberty," says New York City–based Marsha Gordon, M.D., a consulting dermatologist to St. Ives. "The hormones increase sebum production, making the cells that line your pores sticky—which in turn clogs them so that oil can't escape." When oil gets backed up, your pore develops a bump. If it's squeezed or becomes too full and the lining cracks, sebum and bacteria seep out into the skin and provoke inflammation. Chicago-based dermatologist Brooke Jackson, M.D., adds, "If you're involved in sports that require gear like helmets or pads, trapped sweat and dirt can trigger breakouts. It's important to wash your face as soon as possible after workouts."
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