Poison ivy is all natural, but I'm still allergic to it. You never know what will make your immune system go haywire.

Are you still on the cipro? I had bad itching caused by cephalexin, and was told it was an allergic reaction. Although that itching was around my ankles and feet.

In any case, I think the best thing is to talk to your allergist. Also a google search could help -- I had a very unpleasant and unusual reaction to cashews last year, and I learned more about it from a google search than I did from my doctor. I had to use detailed search terms, including exactly where the itching was happening, to find the useful information. (Turns out it's related to the poison ivy allergy...)