Toenail fungus, also known as onychomycosis, is a type of fungal infection that affects the nails, including those on the toes. It is primarily caused by different types of fungi called dermatophytes, but other fungi such as yeast and mold can also be responsible. These fungi thrive in warm and damp environments. https://podiatryabc.com/o-is-for-onychomycosis/