Toenail fungus, medically known as Onychomycosis, is an infection usually caused by microscopic organisms called dermatophytes. When a nail is infected, it starts as a white or yellow spot that will continue to spread through the nail and to the other nails if not treated.
Nails are made up of multiple layers of a protein called keratin, stacked on top of each other. The fungus that infects the nail can be tough to get rid of because it can get in between those layers. And because your nails become brittle due to the fungus infection, your nails could crack, making more space for the fungus to live in. It is also possible for the fungus to get into the part of the nail called the “matrix”, which are cells that manufacture the nail.
Besides the structure of the nail, the fungus can be very resilient. They thrive in dark, damp environments like inside your shoes. It can live without sunlight and rarely goes away on its own. They spread easily and feed on keratin(which is what nails are made of).
Nail fungus infects the nail and spreads fast. When you do decide to get treatment for toenail fungus, you must make sure that you do all the necessary precaution so that you won’t get reinfected.