Fungal Nail Infection?

I have a patient with a very strange hallux. There is a very black powdery part to the nail edge (looks like charcoal) on one side which is not dried old blood. Every time he comes I try to remove ir but it keeps coming back.

I have a patient with a very strange hallux. There is a very black powdery part to the nail edge (looks like charcoal) on one side which is not dried old blood. Every time he comes I try to remove ir but it keeps coming back.

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Fungal Nail Infection?