Cause of pain on top outside of foot after 5K walk. ?

I recently walked in the 5K Race for the Cure. About 2/3 into the walk, I noticed some pain on the top outside part of my left foot.

I recently walked in the 5K Race for the Cure. About 2/3 into the walk, I noticed some pain on the top outside part of my left foot.

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Cause of pain on top outside of foot after 5K walk. ?

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