Medical history and physical exam by a doctor. Laboratory fungal cultures of the material under nails. Most fingernail infections are curable with 6 months of continuous treatment. Toenails require 12 to 24 months of treatment because of their slower growth rate. Most fingernail infections respond well to treatment, but toenail infections are more resistant to treatment.
Recurrence is likely.
Wear light footwear, such as sandals, to allow free air circulation. Don't wear socks or shoes made of synthetic materials. During acute phases, go barefoot as much as possible. Keep feet and hands cool, dry, and exposed to sunlight. For fingernail infections, wear cotton-lined latex or rubber gloves for dishwashing or other cleaning that requires immersion in water or chemicals.