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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.
It is the first exposures that prime the immune system to the food. 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.