Nail Fungus (Onychomycosis)
Fungal infections of the nails are common and are medically referred to as Onychomycosis or Tinea Unguium.
Fungal infections of the nail are typically caused by a keratinophilic dermatophyte infection which are types of fungus that require keratin such as nails, hair, and skin for growth.
The infection invades the nail bed, and this provides an excellent environment for the fungus to survive and grow and spread, as the feet are often warm damp, and dark.
Sweating or working in a warm environment can increase your risk of a fungal infection, and walking barefoot in damp places such a gym and swimming pool changing rooms can increase your risk as these areas are often rich in fungal spores.