Over the years I have experienced an allegeric reaction to lobster (specifically it appears to be in a lobster roll rather than a whole lobster). The most severe reaction was actually a one time episode, probably 20+ years ago...I broke out in hives and was congested. That was the only time I got hives from lobster, but in recent years I have gotten very congested if I eat too many. I seem to be able to eat one occasionally but last summer I had several in one week and became very congested. Today I saw an allergist who gave me a skin test. She said the tests specifically for lobster and shrimp were negative, but the test for shellfish was positive. My question is, how can I test positive for shellfish but negative for shrimp and lobster? I have never reacted to shrimp, so it is possible to be allergic to lobster but not shrimp? The Dr told me to not eat ANY shellfish. And why can I eat lobster roll occasionally but just not too often? And why did the lobster test come out negative? The Dr could not answe any of these questions. I am planning to get a 2nd opinion.