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