of a solution containing a possible allergen is placed on the skin. Then a
series of scratches or needle pricks lets the solution enter the skin. If the
skin gets a red, raised itchy area (called a wheal), it usually means that the
person is allergic to that allergen.
E. Gregory Thompson, MD - Internal Medicine & Rohit K Katial, MD - Allergy and Immunology
How this information was developed to help you make better health decisions.