glomus tumor

n.
  1. A painful tumor composed of specialized pericytes that are usually arranged in single encapsulated nodular masses that occur almost exclusively in the skin.angiomyoneuroma angioneuromyoma glomangioma
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.