Cutaneous plasmacytosis resembling pityriasis rosea in a 66-year-old white woman: A rare disease presenting in an unusual patient demographic

HHV-8: human herpes virus 8 IL: interleukin INTRODUCTION Primary cutaneous plasmacytosis is a disorder of unknown etiology characterized by reddish brown papules and plaques primarily seen on the trunk and most commonly seen in middle-age men of Japanese descent. The disorder was first described by Yashiro in 1976 and later termed cutaneous plasmacytosis by Kitamura et al in 1980. Approximately 70 cases of cutaneous plasmacytosis have been reported in the literature, almost exclusively in the Asian population. Cutaneous plasmacytosis follows a chronic and mostly indolent course with pathologic features of dermal infiltrates with mature polyclonal plasma cells. Rare cases of systemic plasmacytosis with findings of lymphadenopathy, organomegaly, polyclonal hypergammaglobulinemia, interstitial pneumonia, and interstitial nephritis have been reported. Close monitoring with serial surveillance is essential for patients with cutaneous plasmacytosis. We describe a case of primary cutaneous plasmacytosis occurring in an unusual demographic, an older white woman.