Was talking to my little sis, Aliboo on the way to the Salisbury 10M yesterday and discovered that we are both suffering from the running ailment of black toe nail syndrome . For a month or so now one of my toe nails on my left foot has been slowly turning black and has gone rock hard!!. Ali says she has heard of it before and that my toe nail is going to fall off . Has anybody else experienced this? I wonder how anyone else has cured it or did indeed the nail fall off?