Allergy to local anesthesia could be diagnosed by allergy testing. Initially, a skin prick test is performed, in which a tiny amount of anesthesia is lightly pricked into the skin with a plastic applicator. This test is performed on the arm. If you have sensitivity, a red raised itchy hive will appear on your skin within 15-20 minutes. If no reaction to prick test, you will be retested by intradermal method with incremental dose of local anesthesia till you show positive reaction or highest recommended concentration is given intramuscularly. Intradermal test involves injecting a very small amount of the allergen under the skin on the upper arm like TB test.
The testing generally takes about 1/2 hour to 1/2 day depending at what stage you react. If you have a specific allergic sensitivity to any of these allergens, a red raised itchy hive will appear on your skin within 15-20 minutes. Local anesthesia testing will be performed in our office with medical professionals present since the occasional reactions may require immediate treatment. (Pictures in Allergy & Food testing section)