title: Letter: Pyoderma gangrenosum.
mesh_terms: D001706:Biopsy; D005455:Fluorescent Antibody Technique; D006801:Humans; D011711:Pyoderma / Q000276:immunology / Q000473:pathology; D012867:Skin / Q000473:pathology; D012883:Skin Ulcer / Q000276:immunology / Q000473:pathology