Cali had her vaccinations on Saturday, and had a microchip put in. She was also bathed and groomed. Everything has been fine but last night I noticed that she has bumps on her back. They aren't painful as far as I can tell. When I part her hair, they don't appear to be red. I figured that if it were a reaction to the shots or the grooming that it would have shown up sooner. The only thing that is different is that Sunday night I gave her new dog treat that was ham. She doesn't have a problem with any other pork treats or even ham deli meat (i know I shouldn't but I'm weak).
any thoughts? I was going to get some benadryl on my way home and if there's still a problem give her some of that.

agreed! You should talk to your vet about how much benadryl if you are giving it orally and the spray can help too, but if they don't go away in a few days, you should get to the vet and stick with hypoallergenic shampoos for baths - I like the Earthbath line.