A patch test is often used to detect skin inflammation reaction to an allergen (contact dermatitis).
This is commonly the case where an allergic reaction is delayed and takes several days to produce a result. Such substances that cause delayed reactions can include anaesthetics or antibiotics, fragrances, types of jewellery (nickel) and gloves or condoms (latex).
Allergens are applied to a patch placed on your skin, usually on your back and left for 48 hours.
Once the patch is removed, the skin is observed for signs of swelling, redness, and itching, indicating an allergic reaction.
