My 2 year old daughter has had a scaly itching rash only on her buttocks for almost a year now. It looks worse when she gets in the tub (turns really red) & she always complains that it itches. I've tried Alpha phor, desitin, hydrocortisone cream, eczema lotion, baby lotion & nothing seems to work. Could this be eczema? What could I do to help relieve some of the itching & take it away? She is still in diapers, could this be the cause?