The normal reaction after BCG vaccination should be septicemia. If there is no suppuration after vaccination, it is possible that the BCG vaccination has failed and a tuberculin test should be performed 3 months after vaccination. If the test is positive, the vaccination is successful, and if the reaction is negative, the vaccination should be repeated. The normal reaction to BCG vaccine, which is used to prevent tuberculosis, is the appearance of hard nodules about 20 days after vaccination, which gradually soften to form pustules or abscesses. The pus then penetrates the skin to form an ulcer, which then crusts over and forms a permanent scar after the scab has fallen off. If abnormal enlargement of ipsilateral axillary lymph nodes occurs after vaccination, it is important to visit a hospital promptly.