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
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