Patch test

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A patch test is a method used to determine if a specific substance causes inflammation of the skin. It is often used to test for allergens.

The suspected irritant is applied to the skin and held in place with an adhesive patch. Another patch with nothing is also applied as a control. After 24 to 48 hours, the patch is removed. If the skin under the suspect patch is red and swollen, the result is positive and the person is probably allergic to that substance.

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