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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.
To prevent an allergic reaction to peanuts: 1  Understand your allergy and know that you need to protect yourself. Read food labels or ask kitchen staff at restaurants if there are peanuts or peanut oils hidden in any of the foods you order. 2  Understand that no amount of peanut is safe.