Mayo Clinic Minute: Patch testing for contact dermatitis

If you've ever experienced a red, itchy rash appear on your skin after using a certain lotion or even from wearing jewelry, you may be experiencing contact dermatitis. It's caused by a substance you're exposed to that irritates your skin. However, it also can be triggered by an allergic reaction.

In this Mayo Clinic Minute, Dr. Matthew Hall, a Mayo Clinic dermatologist, explains how patch testing is crucial to assess for allergic contact dermatitis.
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