I was on and off prednisone for over 11 yrs out of my 16ish years of having crohns, and the one and only side effect I ever got from it sometimes, not always, was tiny acne all over my back, other than that I never got any side-effects from it...everyone's different, and it was often a life saver for me over the years...unfortunately it no longer has any affect on me but I'm okay with that too since I now use the natural route.
Indeterminite colitis is what they call it when they cannot distinguish between either CD or UC...
With CD the inflammation can affect the many layers of the intestinal tissues, with UC, inflammation remains on the surface of the lining only...
With CD there are skipped patterns of inflammation with healthy tissue in between, with UC the entire area will be inflammed...
CD can affect the entire GI tract from mouth to anus, UC is limited to the colon, sometimes involving the rectom.
:)