Candida is a yeast-like fungus that lives on human skin. It can be found on the mouth, in the intestine and, for women, in the vagina. There are actually more than 150 species of Candida yeasts and of these ten cause trouble for humans. In the case of Candida Albicans, the balance between the yeast cells and the bacteria that kept their numbers in check is upset. The yeast cells multiply quickly and aggressively, especially if the immune system is unable to step in and help the body.