A mycosis is a
fungal infection. Fungi get around a lot, and have been known to infect everything from birds to oysters. The best known mycoses in humans are
athlete's foot or
Tinea pedis, jock itch or
Tinea cruris, vaginal
yeast infections, and
Tinea unguium or
ringworm of the toenails. Fungal infections of the skin generally aren't serious, but
subcutaneous mycoses can be (occasionally even leading to
gangrene), and fungi that get to the major internal organs are often deadly.
A list of some mycoses, add to it if you know of more: