A Case of Epithelioid Blue Nevus Developing on the Lower Lip / 대한피부과학회지

ABSTRACT

Epithelioid blue nevus is a rare variant of blue nevus that has been recently described in patients with the Carney complex. However, sporadic cases have been reported even without the Carney complex. It typically presents as an asymptomatic, blue-gray, smooth-surfaced macule or papule occurring most often on the extremities and trunk. However, a few cases occurring on the mucosa have been reported. A 21-year-old man presented with a 0.4-cm sized solitary dark brownish or black papule on the lower lip. On histological examination, the major part of the specimen showed an infiltration of intensely pigmented epithelioid cells, the rest was composed of mildly pigmented spindle cells. There was no junctional activity, necrosis, or cellular atypia. These findings were consistent with epithelioid blue nevus. The patient did not exhibit any features associated with the Carney complex. No evidence of recurrence was observed during the follow-up period of 24 months. Herein, we report a rare case of epithelioid blue nevus arising on an unusual site.