The crescent-shaped whitish area of the bed of a fingernail is a very important and sensitive nail part and you should be very careful not to damage it.
This whitish half-moon is called lunula (small moon in Latin) and it’s a very sensitive part of the nail. The lunula is actually the visible part of the nail’s root and should not be damaged in any way because if you damage it your entire nail will be permanently deformed.
However, if you just damage the rest of the nail and it falls off or is surgically removed the lunula will remain intact and in its place. It is not actually white but only appears so when it is seen through the nail.
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