Pyoderma gangrenosum, a medical condition in which the body attacks itself in painful ulcers seen in Crohn's disease. This is a picture of the lower half of the left leg.
Author: Crohnie
Original file: http://commons.wikimedia.org/wiki/File:Crohnie_Pyoderma_gangrenosum.jpg
Modifications: square crop and color and level adjusted
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