It may also be normal for the BCG vaccine to not leave a scar. Not all people will have scars after BCG vaccination, there are some people who will not have localized scars after BCG vaccination, and whether BCG vaccination will produce an immune effect and antibody formation cannot be measured based on BCG scars, but depends on the individual’s constitution. The reaction of different people after BCG vaccination also varies. After BCG vaccination, some people will have localized abscesses and purulent secretions, which will naturally fall off and form scars when the secretions are completely drained off, which is also a normal reaction. Regular observation is needed after the vaccination card. If there are any symptoms such as fever, heat, discomfort, etc., you need to consult a doctor in time. If you are worried about not being able to produce antibodies, you can choose to go to the hospital for a TB test to find out if there are any antibodies present in your body.