Allergy testing is generally not painful. The most common type of allergy test, the skin prick test, uses needles called lancets that barely penetrate the skin's surface. You may feel a slight prick or scratch, but it's generally considered to be minimally uncomfortable.
While some people may experience itching at the site of the test if they are allergic to the allergen, this is a normal reaction and not necessarily painful.
If you are concerned about the potential for discomfort, you can discuss your worries with your allergist. They can provide you with more information about the testing process and help you feel more at ease.