Hyuck Hoon Kwon1,2, Dae Hun Suh3,4. 1. Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea. 2. Acne and Rosacea Research Laboratory, Seoul National University Hospital, Seoul, Korea. 3. Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea. daehun@snu.ac.kr. 4. Acne and Rosacea Research Laboratory, Seoul National University Hospital, Seoul, Korea. daehun@snu.ac.kr.