No.
yes
not if you have an ingrown toenail... then it is perfectly normal
underneath a toenail or fingernail (black toenail)
paint it black.
Theres not enough info why your liver is blocked but I know black stool can mean beeding. It will have an bad smell to it.
It turns your toenail dark (sometimes light) yellow, it smells bad and can make your toenail very brittle.
It means you have bruised it.
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.
get your parents to cut your toenails for you, if you are bad at cutting them.
It is bad for using drugs because if you do drugs then your kidneys and your liver will turn black and that will hurt he heart and you will eventually have a heartattack.
Toenail clipings and black hair.
Lung disease, black teeth, addiction, shaky fingers, heart disease, liver cancer, throat disease, mouth cancer, bad breath, blackened finger. It also fills your lungs and liver with black tar.