There is a guy on our team with a foot problem. After practices there is some sort of rust coloration around the toes and toenails on one foot. Keep in mind, this doesn't appear until after practices and only on one foot. He's fairly sure it isn't his shoes or socks, and we think it might be a fungus or something, whatever it is though it looks pretty nasty. Any information about the nature of whatever the stuff is and possible treatments would be great.
Thanks.