I have IBD also (Chron's disease) and I also suffer with acne. Really sore acne like yourself. However when I was taking prednisolone my skin was amazingly clear! That was over a year ago now. Since then, I have got some ZINERYT, (Erythromycin), which is a topical lotion. Its brilliant, and as its a lotion, it doesn't interfere with all the drugs you take for your IBD. It really is good. Zineryt is the generic name, so be sure to ask for ERYTHROMYCIN. See how you get on with it.