The first case of a collision tumor of melanotrichoblastoma and seborrheic keratosis. (8th July 2020) - Mizuta, Haruki; Namikawa, Kenjiro; Takahashi, Akira; Ogata, Dai; Muto, Yusuke; Jinnai, Shunichi; Nakama, Kenta; Tsutsui, Keita; Yamazaki, Naoya