My 10 yrs old has an itchy rash in her butt crack, from the top of her tailbone to the area right above her anus. She has had this rash for one week. I tried A&D ointment but, it seems to have spread wider, moving out towards her butt cheeks. The rash has been staying wet so I stopped using the ointment over the weekend, thinking maybe it needs to dry out. That's making it itch more. Could this be more than just a common rash?