Acne is a common skin condition indicated by comedones (blackheads and whiteheads) and pus-filled areas (pustules). It commonly begins throughout puberty. Acne ranges from some spots on the neck, face, back, and chest, which most teenagers will experience at some point, to a more serious problem that can result in scars and lower self-confidence.
Acne is formed when small pores in the skin, called hair follicles, get blocked. Hair follicles have sebaceous glands, which are small glands located on the skin's surface, attached to them. When these glands produce excessive sebum, the follicles become blocked, resulting in acne.
The symptoms of acne often begin with a plugged pore, which then causes a lesion on the skin. It can range from non-inflamed bumps and blackheads to inflamed, red pimples and pustules. Acne usually appears on the forehead, face, chest, upper back and shoulders.