Black Streaks under the nails (fingernails or the toenails) can be very dangerous. Follow our diagnosis guide to see if you should be worried!
A thick black dark streak could be a subungual melanoma- a type of skin cancer. Don’t be too worried though, the odds are low that you actually have this tough, but better safe than sorry!
Watch the following video to get a better idea if this is what you have:
If the above does not sound like your situation, consider toenail fungus as well.
Symptoms of Toenail Fungus:
Click on this link to our comprehensive nail fungus home treatment guide. Always be sure to see a podiatrist if you are ever unsure!
Good Luck with the Black Streaks Under the Nails!