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 dermatologist undertakes patch testing. Patch testing is used for contact
and differs from
skin prick testing
as it does not test for hay fever allergies, food allergies or hives.
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