From Angela Palmer,
Your Guide to Acne.
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About.com Health's Disease and Condition content is reviewed by Casey Gallagher, MD

Definition: Acne is a chronic inflammatory disease of the sebaceous glands caused by the retention of oil secretions and dead skin cells. Acne presents as inflamed or non-inflamed lesions chiefly affecting the face, neck, back, chest and/or upper arms. It varies in development from very mild to extremely severe.

Also Known As: Acne vulgaris, acne simplex.