Abstract: 【Abstract】 Objective To analyze dermoscopic features of blue nevi. Methods Clinical and dermoscopic data were collected from patients with confirmed blue nevi in the Department of Dermatology and Venereology, Wuxi People′s Hospital from January 2008 to May 2018, and analyzed retrospectively. Chi-square test was used to analyze differences between groups. Results Totally, 65 patients with 66 skin lesions were enrolled into this study. A total of 23 skin lesions were subjected to dermoscopy, which showed homogeneous pattern in 20 （87.0%） lesions, pseudo-pigment network pattern in 2 （8.7%） lesions, and cerebriform pattern in 1 （4.3%） lesion, and the homogeneous pattern was more common than the other patterns （χ2 = 8.79, P < 0.05）. Under the dermoscope, 10 lesions were monochromatic （43.5%）, 11 were dichromatic （47.8%）, and 2 were multichromatic （8.7%）. Scar-like hypopigmentation was observed in 4 lesions （17.4%）, and vascular structures were observed in 5 （21.7%）, including punctate vessels in 4 （17.4%） and linear irregular vessels in 1 （4.3%）. Papillary hyperplasia was observed in 2 lesions （8.7%）. Additionally, pigmentation around lesions, white streaks, dots/globules, blotches, comedo-like openings were observed in 1 lesion（4.3%）each. Conclusions Blue homogeneous pattern is the most common dermoscopic feature of blue nevi. Pseudo-pigment network pattern, cerebriform pattern, scar-like hypopigmentation, multiple vascular patterns, papillary hyperplasia, white streaks, dots/globules, blotches, comedo-like openings can also be observed in blue nevus lesions.

Key words: Nevus, blue, Dermoscopy, Melanocytes