After being bit by our our out bull, my husband had about 15 stitches and was on crutches for over 2 months while the inside if his leg began to start an infection. You couldn't tell from looking at it but after such a long time of not healing, walking wise, I thought we may want to check it out. Now it's all healed and infection is gone, he did rehab and was walking normal shortly after 3 month on crutches and rehab. This was 6 months ago, time of attack. Since, there has been a massive baseball sized lump, where his scar remains. What is that lump? Should we be worried?