Toenail local blackening is not a symptom of onychomycosis

Toenail local blackening may be caused by onychomycosis, but it cannot be ruled out that it is caused by local pressure, trauma, nail nevus, etc. It is recommended to go to a doctor for examination. If it is caused by onychomycosis, it is necessary to apply antifungal drugs to local treatment under the guidance of a doctor.