I came on here because my pekin has that same condition. Long story and running out of options, today we decided to open the white bump with a scalpel. A very large bumble chunk was pushed out. We taped it up, applied vetericyn and neosporin and confined her. So I agree, that bump is the infection! I honestly don’t know if I did the right thing so I’m not saying you should cut it, just that we did and it was definitely an infection, not bone or anything else. I’m on here looking for antibiotic ideas to continue treatment! Best luck.