Is it possible to be allergic to allergy tests but not the actual substance? (i.e. skin pricks)?

I've had plenty of allergy tests like yours and some can be minor allergies. I am technically allergic to chocolate and corn, but have no problems with either. If you are getting skin rashes then you need to find out which allergy it is. You can form new allergies at any time. Example - I always drank tea, but in college had a serious reaction and now cannot drink tea at all!