Purpura
Dermatology Anatomy / Physiology Clinical Abnormalities--Dermis--Vasculature




Purpura

John L. Bezzant, M.D.

Purpura. This patient had vomited very vigorously, and the increased pressure within the capillaries caused some of them to rupture and red blood cells extravasated into the surrounding skin. Because there are red blood cells outside the vessels, compression does not cause this to blanch.