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The most common cause of peanut allergy is eating peanuts or peanut-containing foods. Sometimes direct skin contact with peanuts can trigger an allergic reaction. Cross-contact. This is the unintended introduction of peanuts into a product. It's generally the result of a food being exposed to peanuts during processing or handling. Inhalation.
In the case of peanut allergy, you may not have to eat peanuts or peanut-containing foods to have an allergic reaction. A person who experiences an allergic reaction may have had contact with peanuts in any of the following ways: 1  Touching peanuts. 2  Using a peanut-containing skin care product.