BCG vaccine pus when the baby will not have obvious uncomfortable performance, such as nausea, vomiting and other symptoms, parents do not have to worry too much. BCG vaccine is mostly administered within 24 hours of a child’s birth, and localized suppuration will occur after vaccination, at which time the baby will not have obvious discomfort, such as nausea, vomiting and other symptoms, parents do not have to worry too much. Pay attention to keep the local dry, do not cover the heat, prevent scratching. After the pustules break out on their own, a superficial ulcer will form on the local skin, i.e. BCG scar. If the pus at the BCG vaccination site does not heal for a long time, or is accompanied by local redness, swelling, heat, pain and enlarged lymph nodes, etc., it is necessary for parents to take their children to the hospital in a timely manner to find out the cause of the pus and then treat the symptoms.