Siyu Wang1, Gengwu Dai2. 1. Department of Dermatology, Institute of Dermatology and Venereology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, Sichuan, China graceyuyu@126.com. 2. Department of Dermatology, Institute of Dermatology and Venereology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, Sichuan, China.