Where does a allergy testing happen on your body? stomach? back?

Arms or back: In the very young their upper back would be used. In older children and adults, their arms. Never on the stomach.

On the back: We perform almost all intracutaneous testing on the back. Intracutaneous means the allergen test materials are placed on the skin followed by a point or set of points that makes a minimal puncture of the skin. We save the arms for intradermal tests. These are a select follow-up set of allergens injected into the outer layer of the skin using a fine needle. They're more sensitive but less specific.