Hi,My baby had a BCG injection at 2 months of age. For about two months after the injection, there was nothing visible at the injection site. Then, a little bump formed, which subsequently got red. Over about 6 weeks since the bump appeared, it got bigger, redder and got crusty. Now it looks like there is a yellow spot in it, as if pus is under the skin. Is this an expected reaction? Why did it occur so late? All my friend s babies had a reaction in 4 to 6 weeks after the injection and heals in a relatively short time, not months. Should I be worried?