Onychomycosis, also known as toenail fungus, is a fungal infection that affects the nail area, including those on the toes. It is primarily caused by different types of fungi called dermatophyte fungi, but other fungi such as yeasts and mold can also be culprits. These types of fungi thrive in warm, moist environments. https://podiatryabc.com/o-is-for-onychomycosis/