Anybody else have this happen? Around the time I stopped taking Prednisone, I developed an allergy to most deodorants--I think it's the aluminum zirconium tetra-whatever that is the active ingredient in most. I tried a couple of different ones, but had the same result: itchy rash under my arms that would generally get so troublesome that I'd wash off the deodorant before I could see if it'd get better on its own. Years ago, I started to have a milder reaction to "scented" scent deodorants, but other scents (like "fresh" or the Irish Spring brand) didn't bother my skin. I've since switched to Arm & Hammer natural unscented, or sometimes just simply baking soda. I still get itchy occasionally, but there's no rash, and it may just simply be a side-effect of medications or the Crohn's itself, since I'll sometimes get itchy in a lot of areas.