It depends: Why they are dark? It can be fungus? It can be dried blood, it can be bacterial colononization. Usually, a podiatrist or dermatologist may sample the nail and material under the nail to arrive at a diagnosis and then base therapy on that pathology report.
Answered 9/25/2018
5.7k views
Possible fungus: If due to fungus there are several options topical s. Oral medication, and laser.
Answered 8/17/2016
5.7k views
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