For intradermal injections, you need to select areas with thick subcutaneous fat, such as the surface of the deltoid muscle, around the belly button or the front of the thigh. Before the injection, it is necessary to choose a place where there is no local inflammation or infection, such as subcutaneous nodules, redness or scars. Routinely use a 1ml syringe for injection, after extracting the drug, disinfect the skin surface twice with iodophor, generally use a 45 degree angle to enter the needle, the depth of the needle requires 1/2-2/3 of the needle, slow suction to understand whether there is no injection into the blood vessels, and if everything is judged to be normal slowly inject the drug can be. After the injection, the needle should be removed by using a cotton swab or cotton ball to press on the injected area for a period of time, remember not to rub back and forth, because rubbing may lead to subcutaneous bleeding.