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.
Medical Review:Caroline S. Rhoads, MD - Internal Medicine
Harold S. Nelson, MD - Allergy and Immunology
Harold S. Nelson, MD - Allergy and Immunology
Last Updated: 08/08/2007
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