dr. maria garcia-lloret is the director of allergy research at the ucla medical center. >> tell me which was the worst reaction that you remember. >> i was in ecuador, had some empanadas and i didn't realize they had cooked...that peanut was one of the ingredients. when i puked i swelled up everywhere, and i hadn't really swelled up before. >> the story that you give me, i'm 75% sure that you have a peanut allergy. >> but it was time to find out for sure if that's not bad enough. >> okay phil i'm going to do some allergy skin testing with you. >> that means being stuck with needles. >> so this is kind of amazing there's hazelnut, chocolate, cinnamon, mustard, garlic. >> needles containing nut extract. >> i see number 50, peanut. >> yes, that's the potential culprit here. >> so i'm 15 minutes away from learning what items on this list i'm actually allergic to. should we start the pricking? >> okay yes, here is the peanut number 50 here... the walnut. >> so it's been about five or ten minutes at this point, i definitely feel something itchy back there so i have a feeling it's going to be t