[Primary cutaneous plasmacytoma. A case report and review of the literature].

Primary extramedullary plasmacytoma of the skin is a very rare disease; to our knowledge, only a few cases have been published in the world literature. In this paper, a patient who had a primary cutaneous plasmacytoma of the lower lip for 20 years is described. Serological, radiological and histological examinations excluded the possibility of an underlying multiple myeloma. The position of cutaneous plasmacytomas within the group of malignant plasma cell neoplasias is discussed and the relevant literature is reviewed.