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What is a patch test for allergies?

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For this test, your doctor applies the allergen to a patch. You'll leave the patch on your skin on for 48 hours. If your skin turns red, gets irritated, and itches, there's a good chance that you have an allergy.

From: Allergy Tests and Asthma WebMD Medical Reference

SOURCES:

American Academy of Allergy Asthma & Immunology: "Tips to Remember: What is allergy testing?" 

Asthma and Allergy Foundation of America: "Immunotherapy."

American College of Allergy, Asthma & Immunology: "How Allergy Shots Can Help Control Increasing Asthma Rates."

American Academy of Allergy, Asthma & Immunology: "Tips to Remember: asthma triggers and management."

Reviewed by Dan Brennan on January 29, 2019

SOURCES:

American Academy of Allergy Asthma & Immunology: "Tips to Remember: What is allergy testing?" 

Asthma and Allergy Foundation of America: "Immunotherapy."

American College of Allergy, Asthma & Immunology: "How Allergy Shots Can Help Control Increasing Asthma Rates."

American Academy of Allergy, Asthma & Immunology: "Tips to Remember: asthma triggers and management."

Reviewed by Dan Brennan on January 29, 2019

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What should I know about asthma treatments?

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