Whether or not the nail cap can grow back is related to whether or not the nail matrix is damaged. If the nail matrix is not damaged, it can grow back; if the nail matrix is more seriously damaged, it cannot grow back.
The nail matrix is located under the skin at the root of the nail, if the trauma only hurts the nail cap and does not damage the nail matrix, this case can grow out, but it may take longer. There are also cases where the nail matrix is partially damaged, which may also grow out, but the nail that grows out will have symptoms such as deformity or lack of smoothness.
However, if trauma or infection causes serious damage to the nail matrix, the chances of the nail growing back are relatively small.
Nail cap should be lost as soon as possible to seek medical treatment, for the cause of the standardized treatment, pay attention to maintain local cleanliness and hygiene, to avoid infection caused by the damage to the nail matrix.