Definition of "acne" []

• An inflammatory disease of the sebaceous glands and hair follicles of the skin that is marked by the eruption of pimples or pustules, especially on the face. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Acne artificialis is a term applied to an acne or acne-like eruption produced by the ingestion of certain drugs, as the bromides and iodides, and by the external use of tar; this is also called _tar acne_."
• "The latter is frequently associated with acne (_acne rosacea_)."
• "Blocking up of the outlet of the sebaceous gland (comedo), which is usually the beginning of an acne lesion, may cause a moderate degree of hyperæmia and inflammation, and a slight elevation, with a central yellowish or blackish point results -- the lesion of _acne punctata_; if the inflammation is of a higher grade or progresses, the elevation is reddened and more prominent -- _acne papulosa_; if the inflammatory action continues, the interior or central portion of the papule suppurates and"