Allergy tests are tests used to determine which substances cause an allergic reaction in a person. There are three common methods of skin tests for allergies. First, test puncture of the skin that is placed on the forearm or upper back, a small canditad of substances that may be causing the symptoms on the skin, then the skin is pricked so the allergen it goes under the cutaneous surface and tras15 minutes the reaction was observed for each substance. Second, the intradermal skin test, which involves injecting a small amount of allergen into d ela skin and see if there is any reaction. It is most used to detect allergy to a specific substance. Finally, the patch test, a method for diagnosing the cause of cutaneous reactions that once the substance touches the skin occur.