Yuko Baba1,2, Keiji Tanese3, Yoshifumi Kimura1. 1. Department of Dermatology, Saiseikai Central Hospital, Mita Minato-Ku, Tokyo, Japan. 2. Department of Dermatology, Tokyo Dental College, Ichikawa General Hospital, Ichikakwa, Chiba, Japan. 3. Department of Dermatology, Keio University School of Medicine, Shinjuku-Ku, Tokyo, Japan. E-mail: tanse@a3.keio.jp.