Acne is the development of blackheads, whiteheads, pustules, or cysts. This skin condition is most common in teenagers, but can also occur in adults and children.
Dead skin cells and oils travel up to the surface of the skin through pores. Sometimes there is too much of an oil, called sebum. The extra sebum causes dead skin cells to stick together and block the pore. This is what causes acne. Bacteria can also become trapped in the pore and cause an infection. The infection causes the familiar redness and pus. It can also spread down into the skin and cause cysts.
Last reviewed November 2018 by
EBSCO Medical Review Board
Marcie L. Sidman, MD
Last Updated: 3/14/2017
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