woolly-hair nevus

[wul′ē-hâr]
n.
  1. A congenital condition in which hair in a circumscribed area of the scalp is kinky or woolly.allotrichia circumscripta
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.