erythrasma

[ĕr′ə-thrăzmə]
n.
  1. A bacterial skin infection characterized by reddish brown, slightly raised patches, especially in the armpits and groin.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.