I'm curious is there is a difference in strep rash & scarlet fever? If so what is it? Also is 500mg Amoxocillin every 12 hours, strong enough to fight both?

We cant give you a determination on the dosage of amoxocillin. Suggest you ask the prescribing physician this question, or your parmacist

The dosage of amox is dependent upon the patients weight, as well as other factors.

If you are concerned,it would be in your best interests to return to your doctor.