[Multiple clustered histiocytofibroma. Apropos of a case with immunohistochemical study].

Multiple clustered dermatofibromas constitute an uncommon entity, of which we have collected seven cases in the literature. We observed the case of a 4-year-old girl, who had dermatofibromas confluent in a central plaque of fibrous aspect, located in the lumbar region. The immunohistochemical study showed positive staining for Factor XIIIa antibody, confirming its origin in the dermal dendrocyte.