allergic urticaria
"My itching went down some after taking 10mg of hydroxizine, and that's good, but now I am totally awake, and will be for 36 hours or so, I can tell. That is how I react to Benadryl, but not to Allegra, which doesn't seem to affect my sleeping. The little bit of relief that I have gotten from taking it is not worth the complete loss of sleep. The prednisone I started today is working already, and I think I'll just take that plus Allegra until my rash goes away."