The histologic spectrum of the reactive inflammatory vascular dermatoses.

The varied histopathology of the reactive inflammatory vascular dermatoses requires close cooperation between the clinician and the pathologist. This article presents an overview of the histology of this group of dermatoses, including the figurate erythemas, the pigmented purpuric eruptions, urticaria and urticarial vasculitis, Sweet's syndrome, erythema multiforme, and erythema nodosum.