After BCG vaccination of newborns, localized suppuration is common and is the result of a strong immune response of the body, which is a sign of successful vaccination. If there is no local ulceration, no special treatment is needed, and observation is sufficient. If there is local ulceration, disinfect the area with iodophor and wear clothes that are not too tight to prevent further infection. If the ulceration further expands and does not improve, it is recommended to consult a hospital for treatment. After BCG injection, pus will be formed in about one month, and scabs will appear in two months, and eventually the scabs will fall off and leave a BCG scar.