Allergy is an abnormal response or hypersensitive reaction produced by the immune system in response to substances that are harmless in most individuals like food, drugs, pollen, etc.
To make an accurate diagnosis of the conditions, the doctor may recommend other allergic tests like skin allergy tests. The skin allergy tests are used to identify numerous food allergens, airborne allergens, and contact allergens. The skin allergy tests include skin prick test, intradermal test, and patch test.
Skin prick test– In this test, a small amount of the allergen will be placed on your skin by the healthcare provider. Then the skin will be either pricked or scratched through the allergen using a needle such that the allergen can enter your skin. A localised reaction composed of swelling, redness, and itching will develop within 15 minutes if you are allergic.
Intradermal skin test– A small amount of allergen will be injected into your skin (dermis part of the skin) using a needle and syringe. After some time, the healthcare provider will assess your skin for reactions. This is commonly used for identifying allergies to drugs and venom.
Patch test– In this test, a patch containing a small amount of allergen will be placed on the skin. The reactions would be assessed after 48-96 hours. If you are allergic, then a local rash will develop.
The doctor may also suggest an elimination diet test. This test involves eliminating certain foods and then reintroducing them at a later stage to identify foods that may be causing allergic reactions.