Lunula is located at the end of the nail (that is closest to the skin of the finger), but it still lies under the nail. It is not actually white but only appears so when it is seen through the nail. Outlining the nail matrix, the lunula is a very delicate part of the nail structure. If one damages the lunula, the nail will be permanently deformed. Even when the totality of the nail is removed, the lunula remains in place and is similar in appearance to another smaller fingernail embedded in the nail bed.
It is half-moon-shaped, and has unique histologic features. Examinations concluded that the lunula was an area of loose dermis with lesser developed collagen bundles. It appears whitish because a thickened underlying stratum basale obscures the underlying blood vessels.
The lunula is most noticeable on the thumb; however, not everyone's lunula is visible. In some cases, the eponychium may partially or completely cover the lunula.
Source:- Lunula (anatomy) https://en.wikipedia.org/wiki/Lunula_(anatomy)
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