Symptoms of diaper rash caused by a yeast infection include a red, raised rash on the thighs, abdomen or genitals, according to eMedicineHealth. It may look like there is fluid underneath the rash. Small raised, red bumps also appear along the edges of the rash.
A yeast-based diaper rash typically develops in areas where skin meets skin, such as the skin folds at the crease between the upper leg and pelvis or the area around the anus, notes eMedicineHealth. Yeast infections do not cause contact diaper rashes, which do not typically develop in skin folds. Yeast infections only cause an estimated 15 to 50 percent of diaper rashes.
A baby can get a diaper rash caused by a yeast infection from his own gastrointestinal tract or from another human's touch, explains eMedicineHealth. Sometimes a baby who has this type of diaper rash also has a case of thrush, which is a yeast infection of the mouth.
Parents can treat yeast-based diaper rashes with topical antifungals until the rash clears within four to seven days, states eMedicineHealth. They should also keep the infected areas as dry as possible. Creams with zinc oxide or petroleum jelly applied after bathing also may prevent further yeast infections from forming by creating a barrier on the skin. Allowing a baby to spend time without a diaper also can decrease the risk of yeast infections and help existing infections clear.