Candida albicans is a single-celled fungal organism that is widespread in our environment and normally lives harmlessly in the mouth, GI tract, skin and vagina. Under certain conditions (immature or weakened immune system, broken skin, hormonal changes, antibiotic or corticosteroid use, etc.) an overgrowth of candida can occur, leading to various forms of candidiasis, including oral thrush, yeast diaper rash, nipple/breast yeast, yeast vaginitis, and jock itch.