[Postoperative pyoderma gangrenosum developing after cholecystectomy and placement of a stoma].

Pyoderma gangrenosum is a serious necrotizing skin disease frequently associated with diseases of internal organs. In rare instances it may develop after surgical operations or minor injuries causing traumatization of the skin. Our patient developed the disease immediately after cholecystectomy at the site of the scar on the abdomen, and disseminated foci developed also at other sites of the body. In the second patient it developed in the region of the stoma soon after its establishment during development of ulcerative colitis. Skin manifestations healed after systemic combined immunosuppressive treatment.