what is the skin that grows under the nail
Nail (anatomy) The nail bed is the skin beneath the nail plate.[8][unreliable source?] Like all skin, it is made of two types of tissues: the deeper dermis, the living tissue which includes capillaries and glands,[9][unreliable source?] and the epidermis, the layer just beneath the nail plate, which moves toward the finger tip with the plate. The epidermis is attached to the dermis by tiny longitudinal "grooves"[5] called matrix crests (cristae matricis unguis).[3][9] In old age, the nail plate becomes thinner, and these grooves become more visible.[5]
Human skin Epidermis, "epi" coming from the Greek meaning "over" or "upon", is the outermost layer of the skin. It forms the waterproof, protective wrap over the body's surface which also serves as a barrier to infection and is made up of stratified squamous epithelium with an underlying basal lamina.