The most common cause of black toenails among runners is bruising (bleeding) under the nail. Repetitive trauma of the shoe bumping the toenail can also cause the nail to thicken.
If
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Nail polish can cause discoloration.
Some colors (pigments) can penetrate the nail, especially darker polishes. Also, “nail hardeners” such as formalin and dimethyl urea can cause yellowing when it reacts with
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ATHLETE'S FOOT is a common fungal infection of the skin that can cause peeling and itching.
Does laundering clothes eliminate the fungus?
Researches tested socks worn by patients suffering from athlete’s foot
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