Acne is one of the most common of all skin problems. It affects most teenagers to some degree and even many adults. Acne presents in the form of whiteheads, blackheads, pimples, and in some people, deep painful bumps that look and feel like boils. Acne most commonly occurs on the face but can also appear on the back, chest, shoulders, and neck.
Acne usually begins around puberty, when members of both sexes experience an increase in the production of sex hormones called androgens. These hormones regulate the activity and size of the oil-producing, or sebaceous glands that reside in the pores or hair follicles of the skin. The increased production of these hormones causes the oil glands to get bigger in the areas where acne occurs.
The sebaceous glands make an oily substance called sebum. Sebum travels from the hair follicles to the surface of the skin. The lining of the wall of the hair follicle sheds skin cells, which then stick together with the sebum. The follicle gets clogged, plugging up the opening in the surface of the skin. Whiteheads and blackheads are the result of clogging of the pores. The sebum and cell debris together contribute to the growth of bacteria that live in your pores