Rash?!

This keeps coming and going. It looks awful! We thought she had ring worm, we were using lotrimin. It got a little better. We use dove sensitive lotion and it gets better and goes away and then comes back. I try breastmilk..she has an appt April 8th and I’m going to bring it up. But any ideas or recommendations?? Should I try a Benadryl cream or cortisone?