Dermoscopic Findings in Eruptive Vellus Hair Cysts: A Case Report

Eruptive vellus hair cysts are a type of cutaneous cyst of skin appendages which is usually seen in children and teenager. We report a case of 7-yearold girl presented with 2 years history of multiple, small, brown or blue-gray papules on her chest. Dermoscopic examination of the papules showed nonfollicular blue homogeneous pigmentation. Histopathologically, the cause of blue homogeneous pigmentation was a cystic structure which was located in the mid-dermis and it had connected to an atrophic hair follicle. We think that non-follicular blue homogeneous pigmentation is one of unique dermoscopic findings to eruptive vellus hair cysts because of its lighter, paler blue color with faded outline.