Allergy testing is done here at Utah Valley Dermatology as a skin patch test. Allergy tests are done under the guidance of Dr. David Myers. There are two types of skin tests. During the first skin test, a drop of a suspected allergen is pricked on the surface of the skin, typically the back or forearm. Many of these suspected allergens are tested at the same time for convenience to treat for a wide range of allergens. If you are allergic to one of the allergens, you will experience redness and swelling at the site of the test usually within 20 minutes, but can show up as late as 1-2 days. A follow-up appointment is scheduled to assess the skin and go over the results of the test a couple days after the initial test is performed.