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pityriasis rubra pilaris

(pĭ-lârĭs)
n.
  1. A chronic eruption of the hair follicles, which become firm, red, surmounted with horny plugs, and often form scaly patches.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.