Erythema elevatum diutinum with unusual clinical appearance.

Erythema elevatum diutinum is a rare chronic inflammatory skin disease of unknown etiology with a histopathology of a leukocytoclastic vasculitis. Clinical findings involve symmetrical livid-erythematous to red-brown papules and plaques or nodules which are initially soft but become firmer. The skin lesions are located over extensor surfaces and often over joints.