FUNGAL SKIN INFECTIONS = Fungal skin infections are caused by certain types of fungus, or excessive growth of normally harmless types. Fungal skin infections usually affect your skin because they live off keratin, a protein that makes up your skin, hair and nails. Most fungal skin infections can be treated effectively. Causes of fungal skin infections = You're more at risk of getting a fungal skin infection if you: 1)have recently taken a course of antibiotics 2)are taking steroids 3)have high blood sugar levels (for example, if you have uncontrolled diabetes) 4)are overweight 5)have had fungal skin infections in the past 6)have a weakened immune system caused, for example, by cancer or HIV/AIDS. Moist skin encourages funga...