Allergy Patch Testing is a diagnostic procedure used to identify allergens that might cause contact dermatitis, a form of skin inflammation. Unlike traditional skin prick testing, which involves the injection of allergens into the skin, patch testing uses small patches that contain allergens applied directly to the skin's surface. The patches are typically placed on the back and left for 48 hours to allow the skin to absorb the allergens. The test works by mimicking the allergic response that occurs when a person comes into direct contact with an allergen. If the skin reacts with redness, swelling, or irritation, it indicates that the individual is sensitive or allergic to that specific substance.

The process is Non-invasive and Primarily used for diagnosing delayed Allergic reactions, typically to substances such as fragrances, metals (like nickel), chemicals in lotions, soaps and topical medications. The skin is monitored during the test for any reactions, and follow-up visits are necessary to evaluate the results. On the third day after the initial application, the doctor will assess how the skin has responded to the allergens and determine which ones may be triggering a reaction.

Allergy Patch Testing is an essential tool in identifying contact allergens, providing individuals with the information they need to avoid future reactions.