I started marathon training about 6 months ago. After getting deep into it, I noticed one day that my second toe (next to the big one) on my right foot was pulling away from the toe. I immediately assumed that it was abused from the running (5-10 miles 3 x week). It then turned black a couple of weeks later. Another two weeks passed and it got yanked out and the new nail was busy growing underneath. So now I have had two nails pull out and the third is dark red underneath and appears to be pulling apart. I noticed that my left same toe is now showing a dark red spot as well. Any ideas? I soaked my feet in listerine in case of fungus but unsure if it is the case.