One issue distance runners commonly encounter is black toenails. The discoloration is actually a sign of bleeding below the surface of your nail. If you don’t trim your toenails, they will jam into your shoes as you run, causing this common and unsightly problem.*
Keep your toenails well trimmed to avoid black toenails, also consider a larger shoe with a higher toebox. The black part of your nail will eventually fall off; but if the swelling is painful, your foot doctor can alleviate the issue by making a small hole in your nail plate.
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Photo | Black toenail, 12 days after injury | ©Kevin Teague | Used under a Creative Commons Attribution License