The white sore at the back of the throat may be a granuloma, causing painful swallowing and a referred pain in the corresponding ear.
Such infections may be contagious and diagnosis will be made only after proper investigations to see whether this is strep or not.
Go for a proper treatment.
Hope this helps you
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.