BCG vaccine produce small blister in 1 to 6 weeks.
After 6 to 12 weeks a sore develops which heals with a scar.
BCG injection is given intradermally that means in the skin
But if given deep, it may cause lymph node enlargement or even abscess formation
Abscess may have to be drained or even TB drugs required.
Next Steps
thorough checkup by pediatrician
Health Tips
serious complications are rare after BCG