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You have to be allergic to something first, it doesn't just happen if you're not. You also need to be exposed to the allergen. If this is your first time you've had an allergic reaction to something, you've probably been exposed to it before at least one other time, because you don't become allergic the first time. The immune system decides to turn against it. The first time it just senses it and you become sensitized. Nothing noticeable happens though. The next time you come into contact with it, you get symptoms.

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16y ago

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