Not true
From the red pigment of blood under the nail-bed.
Bruise or pressure.
pretty much nail polish does
It is likely to be a blood pressure problem. Go see your doctor asap.
The nail bed is part of the nail matrix called the sterile matrix. It extends from the edge of the germinal matrix, or lunula, to the hyponychium. The nail bed contains the blood vessels, nerves, and melanocytes, or melanin-producing cells. As the nail is produced by the root, it streams down along the nail bed, which adds material to the undersurface of the nail making it thicker. It is important for normal nail growth that the nail bed be smooth. If it is not, the nail may split or develop grooves that can be cosmetically unappealing.
Onychia is characterized by inflammation and swelling of the nail bed, often accompanied by redness and tenderness around the nail. The affected nail may appear discolored, and in some cases, it can become loose or separate from the nail bed. Pus or fluid may also accumulate under the nail, leading to further discomfort. In severe cases, the nail may become thickened or deformed as the condition progresses.
you can't if you don't have a nail
The nail body, also known as the nail plate, covers and protects the nail bed, which is the layer of skin beneath the nail. The nail body is made up of layers of a protein called keratin and plays a role in protecting the tips of the fingers and toes.
The nail bed
lunale
Yes the nail bed is called the sterile matrix.
The nail part refers to the the visible part of nails on fingers and toes while the nail bed refers to the skin beneath the nail plate.