Hair: Nystatin

I Have Been Using Nystatin for a Horrible Diaper Rash

Has anyone had any problems with the Nystatin? The dr said to use it 2-3 times a day. She has blister like red blemishes near her private. It's right along the diaper line. I am pretty sure that it's not the diapers since we have used them since she was born. I use the pampers. The Nystatin is the only thing that I can think of...