Pigmented basal cell epithelioma arising in the scar of an onchocerciasis nodule.

Pigmented basal cell epithelioma (BCE) arose in the scar of an onchocercoma nodule in a 45-year-old white man. There were extensive fibrosis, inflammation, epidermal hyperplasia, and nests of basal cancer cells. The authors believe that the development of epithelioma in this case was more than a chance occurrence. There is little doubt that the malignant change was subsequent to the scarring-proliferative process of the disease. To the authors' knowledge, this complication has not been reported previously.