A few years ago, I had gotten a sliver under my thumbnail and a black line like you describe appeared. It was that way for about 3-4 years. Last fall, where the line was my nail started to turn white underneath and hurt really bad. I ended up with a staph infection underneath there and had to have a hole "drilled" in through the top of my mail to drain it. I lost my nail, but thankfully it didn't get worse. My nail has grown back and there's no line now.
I think it was just coincidental that it got infected, as the sliver/line incident happened years before. Just thought I'd relate.
I think it was just coincidental that it got infected, as the sliver/line incident happened years before. Just thought I'd relate.
