Patch testing is a test for delayed allergic rashes. Small patches containing cosmetics, common chemicals and other products are placed on the skin. This test is not painful, and the chemicals are left on the skin for 48 hours. This test should always be performed by a specialist such as the doctors at Chicago Allergy & Asthma. Be sure to let your doctor know if you think there was something that caused your rash when it first appeared. This can give your doctor a clue to help decide whether it can be tested.
If the test results are positive, your doctor will provide you with information on what exactly the substance is. We can give you advice on how to avoid those exact substances and prevent reactions from happening. In addition, we can provide specific instructions on how to manage your allergies.
While undergoing patch testing, it is helpful to avoid activities that cause you to sweat a lot because this can cause the patch to not work well. Keep the area of skin dry until your doctor tells you it is okay.