Hello, first and foremost don't be alarmed, these symptoms are fairly common and related to some infections or immune related conditions. Most will go away in a few days by themselves. Still , they can be painful and it will be best to get a diagnosis for treatment and quick recovery. Sadly since many conditions are similar in appearance it is impossible to decide which one it is with out more details. Best option would be to consult a  dentist who would need to Know Did you have any tingling or burning sensation before? Do you have any fever? Have you ever had Similar lessons in the past?