Crohn Disease Presenting as the Cutaneous Rash of Pyoderma Gangrenosum

Pyoderma gangrenosum (PG) is a rare pediatric diagnosis, occurring in 3 to 10 patients per million per year, and most commonly seen in individuals between ages 20 and 50 years. This severe ulcerating skin rash is typically associated with an underlying systemic inflammatory condition. The appearance of PG often coincides with exacerbation of the underlying disease. In the absence of systemic symptoms, misdiagnosis of PG can occur, resulting in delay of appropriate treatment. The disease's visual similarity to soft tissue infections, which have dramatically increased in recent years (Ann Emerg Med. 2008;51,3:291-98), makes isolated dermatologic presentations particularly problematic. We present a case of Crohn disease presenting as the inflammatory rash of PG in the absence of significant bowel symptoms. This case highlights the importance of keeping PG in the differential for inflammatory lesions presenting to the emergency department.