I've had Crohn's and/or colitis since 2004, but have been very well for the last couple of years. I have recently developed a sore spot between my perineum and buttock. At first I thought it was just a septic spot, but it flares up every few days and bleeds loads - if I wasn't already wearing incontinence pads (for another condition) I would need to wear a sanitary towel. Could this be a fistula?