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Positive patch test reaction

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Photo of a positive patch test reaction

Source: National Institute for Occupational Safety and Health (NIOSH), U.S. Centers for Disease Control and Prevention (CDC). Available online: http://www.cdc.gov/

A person’s skin has been tested for allergens. The red, raised itchy area (called a wheal) shows an allergy to balsam of Peru.

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Last Updated: 08/08/2007

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