Dr. Chang-Keun OH, M.D., Ph.D. is an internationally renowned dermatologist and dermatologic surgeon in Korea. He is one of the pioneers of Korean dermatologic surgery and Mohs surgery. He completed his post-doc fellowship in the Department of Dermatology at UCLA. He served as the chair of the Department of Dermatology at Pusan ​​National University, and is currently the director of a private clinic, OZ Dermatology. He served as Medical Advisor to the President of the Republic of Korea, Vice President of the Korean Dermatological Association, President of the Association of Korean Dermatologist, and President of KOREADERMA 2024. His special interests include vascular tumors and malformations, collagen stimulators, drug delivery, and EBDs for acne, pigmentation, scars.