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Primary cutaneous plasmacytosis: a case report.

Primary cutaneous and systemic plasmacytosis is a rare disorder characterized by infiltration of the skin by polyclonal plasma cells of unknown etiology, frequently accompanied by polyclonal hypergammaglobulinemia and diffuse superficial lymphadenopathy. It primarily arises in patients of Japanese descent, and it is exceedingly rare in Caucasians. We describe a 36-year-old Portuguese male who presented with disseminated reddish-brown plaques over the trunk, neck, and upper limbs with normal gammaglobulinemia consistent with a diagnosis of primary cutaneous plasmacytosis.