a leathery hardening of the skin, usually caused by chronic irritation.
a patch of skin so hardened.
Origin of lichenification
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Thickening of the skin with hyperkeratosis caused by chronic inflammation resulting from prolonged scratching or irritation.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.