• Ezgi Aktaş Karabay, Aslı Aksu Cerman, İlknur Kıvanc Altunay, and Özben Yalçın.
• Departments of *Dermatology and Venereology, and †Clinical Pathology, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey.
• Am J Dermatopathol. 2017 Jun 1; 39 (6): 476-478.

AbstractPyoderma gangrenosum (PG) is a rare inflammatory and ulcerative skin disease of unknown etiology characterized by neutrophilic infiltration of the dermis, mainly affecting the lower extremities. Bullous PG is a rare variant of this disease, usually associated with hematologic disorders. Here, we report a case of pathergy-positive bullous PG with subungual involvement associated with ulcerative colitis.

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