Journal of cutaneous medicine and surgery
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Diagnosis of pyoderma gangrenosum can be difficult, leading to overdiagnosis or underdiagnosis. ⋯ Diagnosis of pyoderma gangrenosum should be considered in patients with purulent ulcers affecting the legs or peristomal sites. To confirm the diagnosis, specific features should be sought, including pathergy, crater-like holes or cribriform scarring, and association with inflammatory bowel disease. Other causes of ulceration should be excluded.