Our expert says:
It sounds like it may be, worst case scenario, a stress fracture of that bone. It's a very difficult one to diagnose (well, impossible, over the internet), but the location you've described sounds like it may be a bone injury. The lacing might be the problem, it's possible. You'd know if it was friction though because that area would be red and inflamed after the run.
Has the adjusted lacing fixed the problem?
If the problem persists, like after that marathon, then I think you should see a doctor. THe only way to diagnose a stress fracture is an MRI, but they can also eliminate some other possibles.
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