In patients with Fournier's gangrene, massive debridement is necessary. The debrided region is usually near the anus, which means that management of evacuation becomes difficult and a colostomy is often created for diversion of stool. Our two patients were a 72-year-old man with scrotal swelling and disturbance of consciousness and a 65-year-old man with scrotal swelling and fever. In both patients, CT scanning revealed air in the scrotal sac. We diagnosed Fournier's gangrene and operated on both patients immediately. After debridement, we used a fecal incontinence catheter, a Flexi-Seal® to keep the wound clean of stools without creating a colostomy. Both patients recovered without developing wound infection. These cases demonstrate the usefulness of the Flexi-Seal® for management of evacuation in Fournier's gangrene patients after debridement.