Introduction
Erythema elevatum diutinum (EED) is a kind of leukocytoclastic
vasculitis, first reported by Hutchinson in 1888(1). Its typical skin
lesions usually show symmetrical brownish-red papules, plaques, or lumps
higher than the skin surface, which are mainly located on the extended
side of the limb joints(2). It is reported that EED is associated with
streptococcal infections, IgA paraproteinemia, and some malignant
diseases(3).