Sorry I don't have any suggestions other than to keep it as clean and dry as you can. I know it is a bother, but maybe using a spray bottle of water to clean it often during the day will help the skin be less irritated. How long have you been on Imuran? It takes a while to take effect. If it would calm down the inflammation, I think your problems will be reduced. No quick fixes here, but hopefully it will get better over time. This disease really teaches you patience!
Diagnosed with rectal Crohn's in early 2007. Several peri-rectal abscesses and two fistulae with setons. Allergic to Remicade and Humira. Currently on 6MP, and vitamins D and B-12.