The ball might be scar tissue..
Maybe you should go back to where you had it pierced and ask them to look at it, they might tell you it happens to some people and go away by itself or they might tell you to see a doctor.
It's a bit weird that it's happening so long after you had it done, was it completely healed and then it started bleeding? Mine took ages to heal and didn't look too good on and off for over a year but now it's fine.