herpes gestationis

[jĕ-stā′shē-ōnĭs]
n.
  1. A rare polymorphous skin eruption of unknown origin occurring in late pregnancy that is more common on the extremities than on the trunk. It may recur during each subsequent pregnancy.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.