Ulceration on an old cervical operative scar: Post‐surgical pyoderma gangrenosum induced by recent mastectomy. Issue 10 (30th May 2017) - Shiba‐Tokuchi, Keiko; Moriuchi, Reine; Morita, Yusuke; Takahashi, Hiroko; Obara, Nobuyuki; Okazaki, Minoru; Shimizu, Satoko