Pyoderma gangrenosum with its subtype affecting oral mucosa pyostomatitis vegetans following skin melanoma surgical excision in a patient with ulcerative colitis: a case report - Niezgoda, Anna; Białecka, Agnieszka; Marek-Józefowicz, Luiza; Skrzeczko-Kwela, Ewa; Czajkowski, Rafał (Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii, 2018)