I have a red sore under my tongue, near my back tooth. it hurts to swallow and talk as well. there is also a white patch in my throat near it. ?

You get them often?: Aphateous ulcer or canker sore almost always starts as a red spot then white patchy or develops a tingling or burning sensation before any other symptoms are obvious. If you have a canker sore, your mouth will feel painful. Usually heals on its own within 10 to 14 days. To be sure see your doctor or dentist.

See your dentist: There are n=many things it could be but you need to see your dentist to rule out severe problems.