What is fungal nail infection? Fungal nail infection (also known as onychomycosis) refers to infection of the top or finger nails by fungi (dermatophytes). The infection usually starts at the rim of the nail, which turns whitish-yellow, brown or green. The fungus grows under the nail, causing the nail plate to thicken and crumble. Sometimes the nail becomes partially or completely detached, which can be painful. In some cases the nail is lost completely. How does Excilor treat fungal nail infection? The most important constituent of toe and finger nails is keratin, which most anti-fungal preparations are unable to penetrate. In most cases fungi grow underneath the nail, which makes it difficult to treat. Excilor controls the micro-environment of the nail by acidifying the nail bed. Excilor is able to penetrate the nail, so the nail is treated from inside out. It usually takes a few months before an affected nail looks completely healthy again. On average, a toenail grows 1.5mm in one month. Excilor immediately lowers the pH of the nail, creating an environment that is hostile to fungal growth. However, the damaged nail needs tome to grow out. The efficacy of Excilor has been proven in clinical trials.