The Clinical Characteristics of Patients With Pyoderma Gangrenosum in a Tertiary Referral Hospital: A Retrospective Cohort Study.

Since pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis, epidemiological and clinical data on the disease are scarce. In this single-center retrospective study, we aim to evaluate the clinical characteristics, underlying systemic associations and treatment modalities in patients with PG in a university hospital between 2014 and 2022. It is known that PG most commonly affects the lower extremities, but extracutaneous involvement should also be kept in mind. PG is usually associated with various comorbidities that share a similar inflammatory pathogenesis with the disease. The prevalence of PG-related comorbidities varies in different studies, arthritis and solid organ malignancies were observed most frequently in the current study. Non-PG-related comorbidities including diabetes mellitus, hypertension and peripheral vascular disease can adversely affect wound healing and limit treatment options; therefore, a holistic approach to patients with PG is crucial. Consistent with literature, the mainstay of treatment for PG is systemic corticosteroids and cyclosporine. However, the implementation of biologic agents in treatment-resistant patients is an increasingly important issue in the literature. Antitumor necrosis factors (anti-TNFs) are the most commonly preferred biological therapies, and these agents seem to have paved the way for a paradigm shift in the treatment of PG. In the present study, a relatively high per cent of (23.3%) patients treated with anti-TNFs, most commonly infliximab (87.5%). Recurrence was observed in 46.7% of our patients in the follow-up period and the relapse rate was found to be higher in patients using multiple systemic agents compared to those using single agents (64.7% vs 23.1%,  < .05). In conclusion, we emphasize that early diagnosis and treatment by considering the patient's comorbidities are important in preventing complications, and biologic treatments seem particularly promising in treatment-resistant patients.