Fungal Infection

Fungal infections are common throughout much of the natural world.
In humans, fungal infections occur when an invading fungus takes over an area of the body and is too much for the immune system to handle.
Fungi can live in the air, soil, water, and plants.

Check if it's a fungal nail infection:
    Fungal nail infections usually affect your toenails, but you can get them on your fingernails, too.
    Fungal nail infections usually start at the edge of the nail.
    They often then spread to the middle. The nail becomes discoloured and lifts off.
    The nail becomes brittle and pieces can break off. It can cause pain and swelling in the skin around the nail.