BCG vaccine is administered by a healthcare professional through an intradermal injection slightly below the middle of the deltoid muscle on the lateral side of the upper arm. BCG is a live tuberculosis vaccine, and its common dosage form is injection, which can be used to prevent tuberculous meningitis and granulomatous tuberculosis two kinds of diseases, the target of vaccination for newborns, generally within 3 months of birth should be vaccinated for infants, and for the use of 5 IU PPD test negative children can also be vaccinated, but for the already suffering from tuberculosis, acute infectious diseases, heart disease, immunodeficiency and eczema or other skin diseases should be prohibited patients. It is important to note that this vaccine should not be given to children who have tuberculosis, acute infectious diseases, heart disease, immunodeficiency and eczema or other skin diseases. It should be noted that, about 2 weeks after vaccination, the localized redness, swelling and infiltration can appear, but generally 8 to 12 weeks later, it can be scabbed over on its own, if the local lymph nodes swell and soften to form pustules, it should also be timely to consult a doctor for diagnosis and treatment.