Definition
A patch test identifies allergens causing contact dermatitis, a type of allergic skin reaction. Small patches containing different allergens are applied to the skin, usually on the back. After a few days, the patches are removed to check for reactions. If the skin under a patch is red, itchy, or bumpy, it indicates an allergy to that substance. Think of it like a detective line-up for your skin. 🔍 It's a way of unmasking the culprits behind skin irritations.