It seems like there are so many things to potentially be allergic to. How does/could a lab determine what someone is allergic to?
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Basically, they have small samples of dozens of the most common allergens and rub some of each one on you, and see which ones your body reacts negatively to. They often make a grid pattern on your back, then rub small amounts of each allergen in one square, so that when they see which squares on your back become irritated, they know which items you are allergic to.
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