Professor. Jason, Chih-Hsun Yang accomplished his training at the Chang Gung Memorial Hospital (CGMH). He was a clinical and research fellow in John Hopkins University and Toranomon Hospital (Tokyo) in year 2000. Dr Yang was the director of the Dermatology Department and Cosmetic Center, CGMH from 2007 to 2016. He was elected as the President of Taiwan Dermatological Association in 2012. Dr Yang’s special interest is in varicose vein, dermoscopy and nail surgery.