Skin testing is the most popular allergy test that helps diagnose food, environmental and medication allergies. During a skin test, an allergist will place a tiny amount of an allergen on the surface of your skin by “pricking” the designated spot on your arm or back. In approximately 15 minutes, a red bump will appear in that spot if you are positive for having an allergy. Any red bumps that appear during the skin test will disappear after about 30 minutes.
American College of Allergy, Asthma, and Immunology (acaai.org)
The American Academy of Allergy, Asthma & Immunology | AAAAI