P.H.
I would definitely get a second opinion. It's not because you do not trust your physcian, but it would be a peace of mind for you. I would even take pictures of the rash incase it would be gone again before you get to the doctors. I would be really concerned, because scarlet fever can be fatal. Here is a copy from www.webmd.com of the symptoms of scarlet fever.
Bright red or scarlet spotty rash, usually beginning on the neck or chest (often excludes face, palms and soles)
High fever
Chills
Headache
Sore throat (although half of patients will not have this symptom)
Painful swallowing
Tongue coated with red spots - referred to as strawberry tongue
Swollen glands in neck
Vomiting
I hope this helps. Good luck and may God Bless you and your family.