The method of BCG vaccination is subcutaneous injection. BCG vaccination is also in the upper arm for subcutaneous injection, inoculation can be used to disinfect the needle in the skin surface to make a “well”, and then evenly apply the bacteria vaccine, but also to avoid injecting too deep, so as not to cause localized skin ulceration and pus. BCG vaccine should be inoculated within 24 hours of the child’s birth, through the BCG vaccination can effectively prevent tuberculosis. After BCG vaccination, a red, swollen nodule may appear around the injection site, which then turns into a small white pustule. When the pustule breaks, pus will come out. If the pus is severe, you can use 1% gentian violet to prevent infection. After BCG vaccination, keep the area clean and dry to prevent bacterial infection, and consult a doctor if you have any discomfort.