Usually that you have put too much pressure on it, maybe by using too small, or poorly laced shoes, causing a bleed to form underneath the nail. If it's bad enough, the nail will eventually fall off.
It means you have bruised it.
underneath a toenail or fingernail (black toenail)
It turns your toenail dark (sometimes light) yellow, it smells bad and can make your toenail very brittle.
paint it black.
No.
Not always
You need to push the reset button.
Your big toe nail has a fungus infection. The second sounds like a bad bruise or gangrene. We are not equipped to give a diagnosis so see the doctor.
Ointment that you can apply on a black and blue toenail includes Neosporin. This will not likely help with the bruising, but it can keep it from getting infected, and may help with the pain.
Toenail clipings and black hair.
i think it might mean he/she is a little afraid of you. i have 2 jackson chameleons and my girl one is black. i just got her so she could be frightened causing her to turn black.
it means that the nail has grown into your skin at the side of your toe.