When you go in for allergy testing, the doctor will choose the site for the skin testing. It is usually done on the forearm, although it may also be done on the back. The area is swabbed with alcohol to clean and disinfect the skin before the allergens are introduced.

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As ethnic foods integrate into mainstream U.S. food culture, it’s suspected that the reported sesame seed allergy rate will grow. Common foods that contain sesame seeds include hummus, baked goods, snack foods, and a wide variety of sauces and dressings.

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Unfortunately, peanuts are in many products, so if you discover that you’re allergic, be sure to scrutinize the labels of any processed food or prepared meal. Whether you eat or inhale products cross-contaminated with peanuts, you could be susceptible to anaphylaxis. Doctors also advise putting smartphone technology to good use to better document allergic reactions. “Photos of any skin involvement may be helpful, as many allergic rashes or swelling will resolve by the time of the visit,” says Chicago allergist Dr. Aaron Donnell.

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But some good news — if you’re allergic to finned fish like flounder, bass, and trout, this doesn’t necessarily mean you are allergic to shellfish. One common food allergy that’s easy to identify is the immune system’s intolerance of shellfish. Unlike many common food allergies, shellfish allergies are far more common in adults than children.

Finned fish can just as easily cause allergic reactions as shellfish. While the proteins in fish most often incite the immune system’s reactions, fish gelatin can be responsible for allergic side effects as well. Avoiding seafood altogether might sound easy, but fish like anchovies are often hidden in foods like Worcestershire sauce and Caesar salad dressing. Another huge concern for those with fish allergies is the high chance for cross-contamination, especially in restaurants and other public places.

Crustaceans are easy to identify and avoid, but mollusks can often be mistaken as safe seafood to eat — squid and scallops among them. Some who suffer from shellfish allergies can eat certain types of mollusks, but others must cut them out completely. This salty, nutty treat is often responsible for many serious allergic reactions. When the body identifies peanut proteins as harmful, the immune system releases symptom-causing chemicals into the bloodstream, causing mild to severe allergic reactions.