Diaper rash is any rash on the skin area covered by a diaper.
Almost every child gets diaper rashes. The mixture of bacteria from stools and urine irritates the skin. Diarrhea causes rashes in most children, too. If rashes do not get better, your child may get a yeast infection. You will know your baby has a yeast infection when the rash looks bright red and raw, covers a large area, and has red dots all around it.