<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been having a really bad sore throat and my mouth hurts a lot. What could it be?  <response>: Based on your symptoms, you may have scarlet fever. Scarlet fever is caused by streptococcus bacteria and is characterized by a sore throat, fever, and rash. I will need to perform a physical exam and some tests to confirm the diagnosis. 