Infant Neck Rashes

Dr. Alan Greene answers the question, Why does my baby have a rash and what can I do about it?


My 4-month-old has some kind of rash on her neck. They said it's a yeast infection and to put Vagisil on it for two weeks. It has done some good, but it seems to be spreading. How do I know if I have completely killed the yeast infection?


Getting a rash under the neck is very common at 4 months because the skin of the neck's folds rubs against itself. The heat, friction, and moisture combine to irritate the skin and interrupt the normal outside, protective layer. This rash will often stay there until kids are sitting up most of the day, no matter how it is treated.

Sometimes yeast can get into this irritated skin. When that happens, a yeast cream should reliably get rid of the infection within two weeks, but the rash will usually stay. If the rash is spreading to other spots of high friction or moisture, that would be expected, but if the rash is spreading to normal, exposed skin that doesn't get this kind of stress, it should be checked again.

As for cleansing the area, soap can be irritating. I prefer just using warm water and a very soft washcloth, and then drying it very carefully. Air to the area is very healing, and sometimes a very thin layer of something like A&D ointment can protect the skin.

The information on this Web site is designed for educational purposes only. It is not intended to be a substitute for informed medical advice or care. You should not use this information to diagnose or treat any health problems or illnesses without consulting your pediatrician or family doctor. Please consult a doctor with any questions or concerns you might have regarding your or your child's condition.

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