A case of halo nevus on the scalp = A case of halo nevus on the scalp

다국어 초록 (Multilingual Abstract)

A 17-year old women presented with a 0.5 cm-sized, flesh-colored patch surrounded by a 1.2 cm-sized depigmented halo with white hairs gradually increasing since the last 1 month on the vertex region of scalp. On physical examination, a sharply demarcated halo of depigmentation with poliosis was seen on the vertex area and no lesions were found in other parts of the body except scalp area. The patient had no history of underlying disease. A punch biopsy on the scalp was performed. Histopathology revealed decreased number of melanocytes with sparse superficial perivascular lymphocytic infiltrate and that from the pigmented center showed multiple nests of melanocytes both within the epidermis and dermis. In immunohistochemistry staining of CD68 was was negative and Melan-A showed positive result. Based on these clinical and histological findings, the patient was diagnosed with halo nevus and the patient has been treated with 308-nm excimer laser. Halo nevus commonly occurs over the back and may affect adults or children. Halo nevus is rarely reported to occur over scalp with poliosis. Poliosis is known to occur with a giant congenital melanocytic nevus, blue nevus, nevus depigmentosus, and halo nevus. To date, there have been two reports of halo nevus with polilosis on scalp in the literature. Herein, we report a case of halo nevus on the scalp.