A member asked:

So theres a light black vertical line on my childs toenail its not dark at all and he used to bite his nails really bad?

A doctor has provided 1 answer

The proximal portion of the nail is called the nail matrix or root cells. This area is very sensitive to trauma to the nail matrix. Disruption of nail matrix most probable. If develops on other nails see pediatrician or podiatrist

Answered 1/10/2023

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