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.