A black vertical line on the toenail may be caused by trauma, onychomycosis and onychomycosis.
1. Trauma: generally refers to diseases caused by physical collision or injury, if the patient’s toenail is traumatized, there may be a black vertical line.
2. Onychomycosis: the cause of the disease may be related to trauma, gene mutation and other factors, the nail will appear localized nail black line, some patients may occur in the toenail.
3. Onychomycosis: the cause of the disease is mostly related to the infection of skin fungus, the clinical manifestation is abnormal nails, the nail plate appears discoloration, turbidity and other symptoms, some patients may appear in the toenail with a black line vertical line.
There are many reasons for the toenails to have a black line, it is recommended that patients go to the regular hospital to find out the cause.