My baby is 2 months 6 days old. He got BCG vaccination 2 months back. A pimple has come up in the vaccine area which I believe is normal. However the pimple has turned little yellow..is this a cause of concern?

A. Normally, once the BCG is given (upper right arm), a small pimple appears in 1-3 weeks and lasts up to 6-8 weeks. A small scar will remain when the vaccination heals. However, some possible side effects that may occur include: A drainage or a small scab over the site.