Symptoms & Signs
* Purple-colored spots and patches, which get pale when pressure is placed on them (purpura)
* Skin lesions usually located on the legs, buttocks, or trunk
* Blisters on the skin
* Hives (urticaria), may last longer than 24 hours
* Open sores with dead tissue (necrotic ulcers)
Diagnosis & Tests
The diagnosis is based on your symptoms and how the skin looks after you take a certain medicine or are exposed to a foreign substance (antigen).
Results from an ESR test may be high. Skin biopsy shows inflammation of the blood vessels.
Review Date : 5/31/2009
Reviewed By : Mark James Borigini, Associate Clinical Professor of Medicine, University of California, Irvine, Irvine, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.