The red bumps on your daughter's back and cheeks could be caused by a variety of factors such as a new hygiene product, something she ate, dry air from heating, etc. It seems like a mild case of hives. To help relieve the itching, you can apply hydrocortisone cream twice a day and keep her skin hydrated with a fragrance-free cream after her bath. You can also give her an antihistamine like Benadryl to reduce the itching and reaction. Don't hesitate to reach out if you need any further assistance.