Odd bump on my outer shin...?

So I've had an weird quarter sized bump on my lower, outer shin for about a month now. It's been there since mid way through track season. During track I was a sprinter who did long and triple jump. I had pretty bad shin splints a little bit before the bump appeared and they didn't go away until after the season ended. I ran through my shin splints. The bump has gone down and when I am not exercising it is gone, but it comes back after I run. I am training for cross country. The bump doesn't hurt, and never did. And my shin splints are gone. Could this be some sort of affect from shin splints? Stress fracture? Should I be worried? Thanks!