A 30-year-old man with Crohn’s disease presented to the dermatology clinic with multiple painful ulcers in his groin and perineal area, as well as an ongoing Crohn’s disease flare with fatigue, abdominal pain, and bloody diarrhea. Physical examination of the skin showed deep, linear erosions across the perineum and inguinal folds, on the scrotum and penile shaft, and in the intergluteal cleft.
Which of the following is the most likely etiology underlying the genital ulcers?
A. Ecthyma gangrenosum
B. Knife-cut ulcers from Crohn’s disease
C. Lichen sclerosus
D. Linear IgA disease
E. Pemphigus foliaceus
答案解析：
刀割溃疡是克罗恩病的一种皮肤表现，在皮肤活检上观察到非干酪样肉芽肿性炎症，与胃肠道活检上观察到的相似。
正确答案：B
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