Skin infections are very common. For instance, it's estimated that at any one time in the United States, at least one in five people have athlete's foot, a particular type of skin fungus [source: Wallace].
Skin fungi affect both genders, too. Tinea corporis, a skin fungus that forms on the body's trunk or extremities, prefers women. Athlete's foot tends to strike men more often. Jock itch, probably the most uncomfortable skin fungus, typically affects males, but women aren't immune.