Clear Cell Acanthoma

Clear cell acanthoma is an uncommon benign tumor usually seen as a solitary circumscribed papule or nodule in the middle aged or elderly patients. The most common location is lower extremities but it has been described in other sites. It often has a scaly surface that bleeds easily with minor trauma. Clinically, it resembles pyogenic granuloma. There is some controversy as to whether it is a true neoplasm, a hamartoma, or an inflammatory dermatosis. The lesion is sharply demarcated and shows psoriasiform hyperplasia with fusion of rete ridges.