W Fan1, Q Zhang2, X Ye3. 1. Department of Dermatology, First People's Hospital of Changshu City, Changshu Hospital, Affiliated to Soochow University, Changshu, Jiangsu Province, China. 2. Department of Dermatology, Traditional Chinese Medical Hospital of Changshu City, Changshu, Jiangsu Province, China. 3. Department of Ultrasound, First People's Hospital of Changshu City, Changshu Hospital, Affiliated to Soochow University, Changshu, Jiangsu Province, China.