What causes a vertical white line on the toenail?

Answer:
Leuconychia is evident as white lines or spots in the nail plate and may be caused by tiny bubbles of air that are trapped in the nail plate layers due to trauma. This condition may be hereditary and no treatment is required as the spots will grow out with the nail plate. It also means your nails aren't hard enough.
Contributor: Solomon
First answer by ID1154583058. Last edit by Solomon Petty. Contributor trust: 2 [recommend contributor recommended]. Question popularity: 2 [recommend question].