Depending on how long it lasts it could be you just need to use something like Calmoseptine Ointment, Desitin, or something else for a red irritated rear end. You could have eaten something that irritates you. How long have you had your j-pouch? If it doesn't seem right then you should see your GI. I had problems and assumed they were part of the healing process and waited until my first annual check up to have things looked into. I should have gone in to see the doctor months before I did. So when in doubt my advice is to go!