Nail trauma.: Sounds like your nails are being traumatized by your shoes and bleeding in the tissue under the nail. Shoes may be too tight, too loose or have a ridge on the inside that is catching your nail.
Answered 4/16/2013
5.2k views
Nails : The dark color to nails in a runner is usually due to the trauma the nails take and you get a subungual hematoma or blood under the nail. It will either grow out or fall off on its own. If painful see dr.
Answered 4/19/2013
5.2k views
Blood: Dark color is bruise. Complete regrowth of a toenail takes about a year. It will be shed off as the nail grows. A nail is not a living tissue: it cannot repair itself, only be replaced by new nail.
Answered 4/19/2013
5.2k views
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