After BCG vaccination, you should keep the vaccination site clean and dry as soon as possible to prevent secondary bacterial infection. BCG vaccination bath touched water need to be treated as follows: dry the local skin in a timely manner, with iodine or alcohol disinfection, keep the skin dry and clean; wear loose clothing, pay attention to the daily care, to avoid recurrence of bathing and touching the water. Pus after BCG vaccination is a normal reaction, local pus will appear at the phenomenon of scabs, after shedding that is the formation of BCG scar, if the pus site after getting into the water obviously increased in scope, redness and swelling with pain, pus phenomenon or even the formation of sinus tracts, this time you need to seek medical attention and ask the doctor to carry out a thorough trauma to avoid aggravation of the condition. Therefore, after BCG vaccination, try to avoid getting water on the vaccination site, if accidentally get water, it is recommended to keep the skin as dry and clean as possible, disinfect the treatment in time, and observe the development of the changes, and if necessary, consult a doctor in time.