Acne is a common skin condition caused by inflammation of the hair follicle and oil glands (pilosebaceous unit) giving rise to blackheads, whiteheads, pimples and larger lesions called nodules and cysts.
It occurs on the face, chest and back and may cause scarring. Acne is disfiguring and the resulting depressed scars are permanent, which is why early treatment to target the process that causes it is advised.
People with acne produce more keratin which blocks drainage of oil from the oil gland. Keratin is a protein made by skin cells.
Acne sufferers also secrete excess oil as they are more sensitive to male hormones in their body. Note that ladies also have male hormones. The excess oil and keratin form plugs called whiteheads and blackheads or comedones.
Acne sufferers also have a bacteria called P. acnes which act on these comedones causing inflammation. These inflamed lesions are commonly called pimples, which are red bumps or red bumps with pus. More serious inflammation results in larger bumps called nodules and cysts.