Upregulated programmed death ligand 1 expression in nivolumab‐induced lichen nitidus: A follow‐up report with an immunohistochemical analysis. Issue 9 (8th July 2020) - Komatsu‐Fujii, Takayoshi; Nakajima, Saeko; Iwata, Masashi; Kataoka, Tatsuki; Hirata, Masahiro; Nomura, Takashi; Kabashima, Kenji