Patch tests are used to identify substances which cause a type of allergy called delayed-type hypersensitivity. A chronic or worsening skin rash is the most common reason a patch test is done.
Patch testing might be helpful if you have any of the following:
- Suspected allergy to a skin care product
- Rash on the hands, feet, face, or eyelids
- Eczema which isn’t getting better with usual treatment
How is it done?
Patches containing many potential allergens on small panels will be applied to your skin, usually on your back. After 48 hours, we will remove the patches. The results can be read at least 1-2 days after the panel is removed. We will give you information on how to avoid any substances to which you are sensitive.
For more information: https://www.aaaai.org/conditions-and-treatments/conditions-dictionary/patch-testing