Granulomatous vasculitides and the skin.

Wegener's granulomatosis, lymphomatoid granulomatosis, and Churg-Strauss granulomatosis may all have cutaneous involvement. The morphology of cutaneous lesions in these disorders varies from macular erythema to frank gangrenous ulceration. Most often lesions are located on the extremities; however, truncal or facial involvement has been reported, the latter especially in Wegener's granulomatosis. A common histologic finding in these cutaneous lesions is necrotizing vasculitis. However, it is also possible to see Churg-Strauss extravascular granulomas and even periarteritis. Cutaneous involvement with these three forms of systemic granulomatosis generally parallels the systemic course. The treatment for the cutaneous lesions is dictated by the treatment for the systemic vasculitis. It is important to recognize that the cutaneous extravascular granuloma and cutaneous granulomatous vasculitis can be associated with other disorders in addition to systemic granulomatosis. These disorders include most importantly lymphoproliferative diseases, inflammatory disorders such as arthritis, autoimmune diseases, and other inflammatory disorders such as sarcoidosis. Cutaneous involvement with giant cell or temporal arteritis is not common, but ulcerative temporal-parietal scalp lesions are distinctive. Although not common in the United States, Takayasu's arteritis may have several cutaneous manifestations, including erythema nodosum-like lesions. Granulomatous vasculitides have a myriad of cutaneous manifestations. Knowledge of these manifestations may allow for prompt diagnosis in many cases and increased surveillance in other cases for associated systemic illnesses.