There are many kinds of fungus that live in the human body. One type is called candida. It’s a type of yeast that normally lives in small amounts in places like your mouth and belly, or on your skin without causing any problems, but when the environment is right, the yeast can multiply and grow out of control.
The infection it causes is called candidiasis. There are several different types of it. Most can be easily treated with over-the-counter or prescription medications.