<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, I have been having a fever and facial pain for a while now, and I noticed that there is a lesion in my mouth. What could be wrong?  <response>: Based on your symptoms and the lesion in your mouth, it could be an oral mucosal lesion. Its a common condition that can cause discomfort and pain. We can run some tests to confirm the diagnosis and start appropriate treatment. 