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See also Overview of Fungal Skin Infections. Candida yeast is a normal resident of the mouth, digestive tract, and vagina that usually causes no harm. Under certain conditions, however, Candida can overgrow on mucous membranes and moist areas of the skin. Typical areas affected are the lining of the mouth, the groin, the armpits, the spaces between fingers and toes, on an uncircumcised penis, the skinfold under the breasts, the nails, and the skinfolds of the stomach.