Patch Testing

Patch testing is a technique used to determine whether a particular substance causes

allergic reaction

in patients. A patch test may be considered for a patient with

dermatitis

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

allergies

and differs from

skin prick testing

as it does not test for hay fever allergies, food allergies or hives.

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