chronic desquamative gingivitis

n.
  1. A diffuse or patchy, often painful inflamed area of the gum caused by changes to the connective tissue as a result of the atrophy of epithelial cells.gingivosis
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.