Definition:

1. Acne is a skin condition characterized by whiteheads, blackheads, and inflamed red pimples or "zits."
   ADAM Health Illustrated Encyclopedia
2. Acne is a common inflammatory skin disease characterized by pimples on the face, chest, and back. It occurs when the pores of the skin become clogged with oil, dead skin cells, and/or bacteria.
   Gale Encyclopedia of Alternative Medicine
3. Acne is a skin disorder that leads to an outbreak of lesions called pimples or "zits." The most common form of the disease is called acne vulgaris—the rash that affects many adolescents. Acne vulgaris is triggered by the hormonal changes that occur in puberty.
   Gale Encyclopedia of Children's Health
4. Acne is a common skin disease characterized by pimples on the face, chest, and back. It occurs when the pores of the skin become clogged with oil, dead skin cells, and bacteria.
   Gale Encyclopedia of Medicine
5. An inflammatory follicular, papular, and pustular eruption involving the pilosebaceous apparatus.acne vulgarisprobably a corruption (or copyist's error) of G. akmē, point of efflorescence
   Stedman's Medical Dictionary, 28th Edition. 2006 Lippincott Williams & Wilkins

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Illustration

Acne - close-up of pustular lesions