Survivor since 2012
I had the very same reaction -- it was to the Taxotere. After each of the first few treatments I broke out in a red rash all over my torso, including my face and hands. I took Benadryl at home and they also recommended Allegra, as with Vicki. I also got Benadryl IV before chemo, as well as steroids. My onc DID think it was a slight allergy.
A word of caution: my allergic symptoms progressed with each treatment, and additional symptoms developed. I was able to finish about 3/4 of my final treatment. I'll share that information with you if you like but please know (and I'm sure you do) that everyone's different.