Patch testing is a technique used to determine whether a particular substance causes
in patients. A patch test may be considered for a patient with
potentially caused by a substance at the person’s home or office such as preservatives or fragrances in shampoo or sunscreens, hair dye or chemicals such as nickel. A
undertakes patch testing. Patch testing is used for contact allergies and differs from skin prick testing as it does not test for hay fever allergies, food allergies or hives. Patches are applied with the allergens tailored for the patient across their back. Patches are left on for around five days. Positive allergic reactions will present as a rash of varying irritability. If there are strong positive reactions an ‘angry back’ response can occur where dermatitis flares up creating a false positive result. Further testing may be required to diagnose the particular allergen.
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