A Case with Unique Dermoscopic Findings: Collision of an Apocrine Gland Cyst and a Trichoblastoma.

We report a case of a blue-black nodule on the left upper eyelid of a 77-year-old woman. Dermoscopic examination of the lesion revealed a purple or purple-red homogenous opaque area like that often observed in apocrine gland cysts and a yellow-whitish homogenous structure with arborizing vessels. After resection of the tumor, a final diagnosis of collision of an apocrine gland cyst and a trichoblastoma was made. We should note the possibility that trichoblastoma may exhibit a yellow-whitish homogenous structure in dermoscopy.