Allergy skin testing with Allergy & Asthma Care Rockland is done with one of two testing methods, either a prick/intradermal test or a patch test. Both are used to find out what substance or allergen is causing the allergic symptoms. Prick testing is often times the initial type of allergy skin test that is performed to see whether someone is allergic to food, pollen, dander, medications or a bee sting. Skin prick tests are done by placing a drop of the suspect allergen on the patients back or forearm. This test provides rapid results, and is usually quite accurate. If prick testing is negative, then intradermal (under the skin) testing may be performed. Results for both forms of testing are usually available within 15-20 minutes. Patch testing is a different form of allergy testing, usually employed for evaluation of a contact dermatitis. This form of testing involves the placement of liquid or gel-like allergens in a well that is taped to the skin and left in place for 48-72 hours and then removed.