Just about every teen will find at least one blackhead or whitehead on his or her skin by age 17, and some teens will develop more severe acne, which can leave scarring if not treated.
The culprits of acne, experts say, are heredity and hormones. At puberty, the sebaceous or oil glands around the hair follicles on the skin enlarge, and oil production increases. Then, the ducts surrounding the follicles become clogged, and a whitehead or blackhead -- called a comedo -- results. If a blackhead or whitehead becomes inflamed, a raised, red pimple develops.
"Comedones, or 'zits,' typically form on the central face area, and can be the first sign of puberty," says Patty Hicks, M.D., a pediatrician on staff at Children's Medical Center of Dallas.
Most cases of pimples, blackheads or whiteheads will clear up quickly, but for some, acne can cause extremely painful, cystlike lesions. Acne can continue for 10 years, but typically vanishes when a person reaches his or her early 20s. For some, however, acne can continue well into adulthood.
Determining which type of acne lesions a teen has is the first step in directing treatment. There are four common types: