A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed ...

While pain is rare with nail fungus, severe cases of this condition may cause discomfort when wearing shoes or gloves. Related: What Causes a Toenail to Turn Black? Nail fungus occurs when certain ...

The fungus that causes toenail infections and athlete's foot seems to have lost the knack of sexually reproducing, making it an easier target for drug treatments, US scientists say. Lab tests ...