Cutaneous vasculitis update.

The classification of cutaneous vasculitis and its general principles, including clinical patterns, pathogenesis, and causes, are reviewed in this article. Several types of cutaneous vasculitis are discussed in detail, including Henoch-Schonlein purpura, erythema elevatum diutinum, and cutaneous polyarteritis nodosum. The approach to treatment for cutaneous vasculitis also is reviewed.