How does a skin allergies test work?
In an allergy skin test a small amount of the suspected allergen will be placed on or below the skin to see if a reaction occurs. There are three types of skin test: Skin prick test – this involves a small drop of solution being placed on the skin and then a series of scratches or needle pricks will allow the solution to enter the skin. If the skin turns red and itchy then it shows a positive reaction and the person is allergic to that particular allergen. Intradermal test – If a particular allergen did not cause a reaction in the skin prick test but it is still thought to be an issue then a small amount of the solution is injected into the skin. Skin patch test – in this last type of skin allergies testing a small amount of allergen solution is placed on a pad and then taped to the skin for 24 to 72 hours. This test is used to determine if the patient has contact dermatitis.
