The skin under my toenail has turned blueish to dark gray. I have not injured it. It is sore on the bottom of the toe from time to time but not always. I am not an athelete but I do try to walk 2 miles 4 or 5 times a week. The toe has looked like this for roughly two maybe three weeks but I had polish on them prior to that so I can't say for sure.
Is there something I should be doing for this toe?