The effect of BCG vaccination is usually not affected by squeezing out the pus. Normally, after BCG vaccination, the body is stimulated to produce an immune response, which means that the pustules will appear after successful inoculation. After the pus subsides, a round scar will form at the vaccination site. The pus at the BCG vaccination site should not be squeezed out, because if it is squeezed out, the process of squeezing will cause inflammation or infection at the vaccination site, which may cause unnecessary physical harm to the baby. If the pus is squeezed out after the pus appears, it will not affect the effect of vaccination under normal circumstances. Because the body’s immunity to the tuberculosis bacteria has been activated at this time, there is no need to worry too much and there is no need to be vaccinated again. Therefore, after BCG vaccination, we should pay attention to the observation of the vaccination site, if there is obvious discomfort or abnormal manifestations of timely consultation, under the guidance of professional doctors to prevent adverse reactions.