I get my skin testing done on the 12 September 2006 and while I was with the Doctor yesterday she told me it is possiible to have allergies with negative results in skin testing, and that I would be a good candidate for allergy shots(this freaks me a little). We are all exposed to so many things it's impossiible to test for everything. Hope this helps, and hope you feel better. Ask this question to your doctor on your next visit, sometimes I take a list of questions.