Abstract: 【Abstract】 Objective To preliminarily investigate dermoscopic characteristics of trichoblastoma, and to provide ideas for clinical diagnosis of trichoblastoma. Methods Clinical data were collected from 5 patients with trichoblastoma who underwent both dermoscopic and histopathological examinations in Wuhan No.1 Hospital from November 2018 to July 2021, and dermoscopic features were analyzed retrospectively. Results According to the presence or absence of pigments, trichoblastoma was divided into 2 subtypes: pigmented trichoblastoma （3 cases） and non-pigmented trichoblastoma （2 cases）. Dermoscopic examination of the 3 cases of pigmented trichoblastoma showed blue-gray ovoid nests （3 cases）, arborizing vessels （2 cases）, blue-gray globules （2 cases）, bright white structureless areas （2 cases）, concentric structures （1 case） and ulcers （1 case）; no yellow-whitish homogenous structure was found. As for non-pigmented trichoblastoma, dermoscopic features included arborizing vessels （2 cases）, yellow-whitish homogenous structures （2 cases）, bright white structureless areas （2 cases） and blue-gray globules（1 case）; no ulcers or blue-gray ovoid nests were observed in either case. Conclusion Dermoscopic patterns differ between pigmented and non-pigmented trichoblastoma, so dermoscopy can provide preliminary diagnostic clues for trichoblastoma.

Key words: Skin neoplasms, Dermoscopy, Diagnosis, Neoplasms, basal cell, Trichoblastoma