Dermoscopic features of clear cell hidradenoma.

sional bleeding was also noted. Physical examination revealed an 11 ! 8 mm, dome-shaped, flesh-colored nodule with ulceration on its surface ( fig. 1 ). On dermoscopy, amorphous whitish areas with some linear or hairpin-like vessels were seen at the periphery. Reddish purple areas were also present ( fig. 2 ). The nodule was surgically excised under local anesthesia. Histologically, the tumor was composed of solid tumor cell nests with abundant cystic spaces or ductal structures. In solid nests, many clear cells and some slightly dark cells were seen. Most of the cystic spaces contained homogenous eosinophilic material, and some of them were filled with red blood cells ( fig. 3 ). Based on these findings, a diagnosis of clear cell hidradenoma was made. Clear cell hidradenoma, also known as nodular hidradenoma or solid cystic hidradenoma, occurs most commonly on the head, neck and anterior trunk [2] . Ulceration is seen occasionally [3] . Histologically, the tumor is composed of a lobulated mass of clear cells and various-sized tubular laminae and abundant cystic spaces. Dermoscopy is now widely used as a tool to diagnose many pigmented and nonpigmented cutaneous tumors [4] . In the present case, dermoscopic examination revealed reddish purple areas and some linear or hairpin-like vessels on the surface of the tu