What is "intradermal injection"

n. an injection into the skin

Intradermal injection is the injection of a substance into the dermis, just below the epidermis. This route has the longest absorption time as compared to subcutaneous injections and intramuscular injections. As a result, it is used for sensitivity tests, like Tuberculin and allergy tests, and for local anesthesia. Additionally, the body's reaction to substances is more easily visible since it is closer to the surface.