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Would be the nail root, because it is the potion of the nail that is buried in a fold of skin.
The extent of the germinal matrix of the nail, lies beneath the nail fold, extends beneath the nail root and generates nail tissue.
eponychium or cuticle, is the fold of skin at the proximal end of the nail.
A paronychia is an infection around the nail.
the cuticle its the clear part on your nail slightly off your skin