Pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis, closely associated with the immune system. Its pathogenesis is currently not clear. The lack of specificity in the clinical manifestations and histopathological changes of PG leads to a long clinical diagnosis cycle and even misdiagnosis, which is easy to delay treatment or promote the deterioration of ulcer wound. The diagnosis of this disease is still very difficult, which poses a great challenge to wound repair practitioners. This article reviews the research advances on the pathophysiology, clinical features, and diagnosis of PG in recent years, with the aim of providing reference for relevant clinical practitioners.

Pyoderma gangrenosum; Diagnosis; Pathology, clinical; Clinical typing