Patch testing can be helpful in determining if you're allergic to a specific substance. Small amounts of different substances are placed on your skin under a sticky coating. After 2 to 3 days, your health care provider checks for a skin reaction under the patches.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
A generous benefactor has pledged $1 million and challenged us to raise an additional $250,000. Help us reach our goal!