hi, my dd is 7mth and a couple of weeks ago cut her 1st tooth... she has terrible teething rash that i just cant shift!!! its raised and pimply it looks sore and horrible its all under her chin, on her chest and cheeks... i change her bibs regularly and put sudocrem on of a night when she doesnt drool, and put vaseline on of a day but it just wont shift....any ideas please!!!! will try anything if it will help !!!