I found that out the hard way.
Yet, if I have skin
scratch allergy tests, the tests all show negative, except for
a couple of things, like birch and dust mites. My allergist recognizes, though, that this doesn't mean that someone doesn't have a reaction to a certain item. I will throw up now if I eat lettuce or spinach. Yet, the allergy tests show negative for an allergy. Obviously, though, I'm still having a bad reaction to the produce.