We recently observed a patient with peristomal pyoderma gangrenosum, superficial granulomatous type, associated with collagenous colitis.
A 52-year-old woman presented with painful peristomal ulcers. The ulcers (Figure 1) began 2 weeks after she had a diverting Brooke ileostomy and total colectomy to treat intractable diarrhea caused by a combination of collagenous colitis and pelvic floor dysfunction. The diarrhea had been recalcitrant to treatment and had led to considerable and disabling difficulties with frequent liquid bowel movements and incontinence necessitating her stopping work. She had no history of ulcers.
Davis MDP, Nakamura KJH. Peristomal Pyoderma Gangrenosum Associated With Collagenous Colitis. Arch Dermatol. 2007;143(5):659-675. doi:10.1001/archderm.143.5.669