acne vulgaris

[ vŭl-gârĭs ]

n.

An inflammatory eruption affecting the face, upper back, and chest, consisting of blackheads, cysts, papules, and pustules, and occurring primarily during puberty and adolescence.

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What does “vacillate” mean?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.