Onychomycosis is the medical term defining mycosis
of the nail, that is to say a growth of microscopic fungi under the nails or toenails. Principal causes include heat and humidity caused by sweating, a frequent occurrence in closed shoes and the perfect environment for a fungus. The damage to the nail is often linked to the damage to the spaces between the toes and sole of the foot. The main symptom is an altered nail appearance, which lifts off the nail bed, becomes deformed, and generally turns yellow. Treatment consists of removing the infected part of the nail and applying an antifungal
substance (that eradicates fungus).