Nails with black vertical lines

The reason why black vertical lines appear on nails is as follows. First, nail mother mole, when nail root hair layer long mole, black mole will move forward with nail growth performance as black stripes. Second, dye contact, some people in hair dye nail lines will contact dye, performance as black vertical lines, generally a few weeks will fade. Third, fungal infection, fungi release melanin metabolites, local nails dyed black stripes, can do fungal inspection clear.