Cutaneous Rosai-Dorfman disease in a middle-aged man: A case report.

The present study describes a case of cutaneous Rosai-Dorfman disease (CRDD). The clinical manifestations and therapeutic options of CRDD vary, and the etiology of the disease is still unknown. The clinical manifestations include single or multiple yellow-red to brown or purple papules, nodules and/or plaques, with the face being the most frequently affected site. A 52-year-old man presented with an 8-month history of multiple lesions on his face. Physical examination revealed a number of yellow-red papules and nodules, the majority of which had coalesced into plaques. The histological finding from a red papule showed a dense, dermal infiltrate, which was predominantly composed of large histiocytes, strongly positive for S-100 and cluster of differentiation (CD)68 but negative for CD1a, mixed with aggregates of lymphocytes and scattered plasma cells and eosinophils. The patient showed only a marginal improvement with a month of oral, low-dose prednisone.