caput succedaneum

[sŭk′sē-dānē-əm]
n.
  1. A swelling formed on the presenting part of the head of a fetus during labor, resulting in edema and varying degrees of scalp hemorrhage.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.