What is acne?
Acne is a skin problem that occurs when the hair follicles of your skin are blocked by a mix of dead skin cells and sebum (oil). When this happens, bacteria can grow in the plugged hair follicles and cause more skin irritation.
Acne can occur anywhere on skin, but is most common on the face, neck, chest, and back. It usually starts in the early teen years, when the oil glands in the body start making more sebum, but can last into or begin in adulthood, too.
Written by familydoctor.org editorial staff