Three purposes of intradermal needle injection

① Drug testing for the prevention of allergies, such as penicillin skin test;

(2) preparation before local anesthesia, such as procaine skin test;

③ Vaccination, such as BCG vaccine. If you pay attention, there are three small intradermal injections: the needle is small, the syringe is small, and the needle Angle is small. In addition, the injection of liquid medicine is generally small. Because of the abundance of nerve endings in the skin, intradermal injections can be painful, and in fact, they can be more painful than other injections. Intradermal injections are often given on the inner forearm, where the skin is thin and local reactions are easy to spot. After intradermal injection, ridges will form on the skin surface, which is a normal phenomenon, most will disappear within half an hour.

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