After BCG vaccination, there will be local redness, swelling and pus flowing, etc. When the local redness, swelling and pus flowing gradually recover, they will fall off on their own, and after they fall off, a small hole will be formed. This is normal and parents do not need to deal with it. Just pay attention to avoid local infection by not getting wet and not bathing within 3 days after BCG vaccination. The vaccine should be administered in a light and easily digestible diet within 3 days to avoid stimulating the stomach and intestines and causing digestive discomfort, which may affect the vaccine’s effect.