My shin bones are both a little bit bumpy, which I assume is because of shin splints, but on my right shin I also have these two bumps that are just a little smaller than BB pellets. One is about an inch above the other. One I've had for a couple years, the other is new. They move a little bit--like, you can't push them up and down the bone but they don't feel totally attached to it either. Are these also related to shin splints? Should I have a doctor look at them? (They never hurt.)