The marks left after BCG vaccination are actually scars, no scars after BCG vaccination is usually a normal phenomenon. Whether there is a BCG scar is different from person to person, the scar is actually different people have different reaction to BCG vaccine, most people will have a slightly strong reaction will appear in the inoculation pus, and then fall off to form a scar. But there are also a small number of people who have a mild reaction to BCG vaccine, after inoculation, the skin surface can not see any traces of several, which is also a normal phenomenon. BCG is a vaccine that babies need to be vaccinated against after birth, which can prevent tuberculosis and tuberculous meningitis. The success of the vaccination can not be measured by the presence of scars, but rather by the production of antibodies in the body to determine whether the vaccination is successful. It is normal that there is no scar after BCG vaccination, so don’t worry about it. If any discomfort occurs, it is recommended to consult a doctor in time and actively cooperate with the doctor for treatment.