Department of Dermatology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, 701, Taiwan, R.O.C. Department of Photonics, National Cheng Kung University, Tainan, 701, Taiwan, R.O.C. Department of Dermatology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, 701, Taiwan, R.O.C.. kylehsu@mail.ncku.edu.tw. Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu, 300, Taiwan, R.O.C. Department of Photonics, National Cheng Kung University, Tainan, 701, Taiwan, R.O.C.. stseng@mail.ncku.edu.tw.