stomatitis medicamentosa

[mĕd′ĭ-kə-mən-tōsə]
n.
  1. Allergic inflammatory changes in the oral soft tissues associated with the use of drugs or medicaments, usually those taken systemically.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.