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Key Clinical Message Pyoderma gangrenosum (PG) is a neutrophilic dermatosis associated with underlying disorders. The association between PG and solid organ tumors (SM), including gynecologic cancers, has been previously reported. Here, we report a case of a 61‐year‐old woman with pyoderma gangrenosum on the posterior auricular region associated with an underlying fallopian tube carcinosarcoma: a rare and aggressive gynecologic malignancy. The patient's ulcer responded favorably to treatment, and surgical resection of the tumor was performed. The patient was then referred for further cancer management. No new lesions or recurrences were found over the 18 months of routine follow‐up.