Post-traumatic Pyoderma Gangrenosum.

 Chronically nonhealing wounds caused by pyoderma gangrenosum (PG) are rare and often misdiagnosed. Since PG has no pathognomonic features, the diagnosis is based on clinical grounds. It is a diagnosis of exclusion and presents a considerable challenge, particularly in the absence of systemic diseases commonly associated with PG. Mistreatment or delayed proper treatment can be harmful to patients. The need to recognize trauma (pathergy) as a potential trigger of PG is important for the optimal management of these wounds. The authors present 5 patients who had PG following different forms of trauma at or near the wound site..