Toenails are grey and turning into black

Dear Ask The Doctor:  My toenails are grey and turning into black. What should I do to make it normal again?
 

Dear Patient:  Black toenails could be caused due to trauma of the nail leading to the development of subungal hematoma or a fungal infection or onychomycosis. Black toenails are mostly harmless. However, if you may require to take oral anti-fungal drugs if a diagnosis of onychomycosis has been made.

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