erythema annulare centrifugum

[sĕn-trĭfyə-gəm]
n.
  1. A chronic recurring erythematous eruption consisting of small and large annular lesions that can be distinct from each other or joined together.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.