I'm 55 and in great health. My toenail polish was chipping off and when I went to remove it so I could add new polish, I noticed underneath the left side of my left toenail, it was black. At first I thought, "wow, I should scrub my feet better when bathing," but quickly realized it was a bruise. Then when taking off the polish on my right foot, I noticed that also, on the right side of the right big toe, there was also bruising. In reading everyone's posts, it seems this is more common that I first realized, and figure whatever it is, it's probably caused by the same thing in all of us. That being said, it just seems odd that everyone's doctor acts as though they've never heard of this before. I'm going to make an appt. with my doctor and will report back with what I find.