I have had a canker sore type of sore under my tongue, and it felt sore in front of my bottom front teeth on my gum line as well as inner bottom lip. Doctor said just rinse with salt water. Didn t help, so I purchased canker sore medication. This took care of the sore under the tongue but my inner bottom lip still feels weird: very dry and somewhat sore. It is uncomfortable to eat, speak. The tip of my tongue also feels like it was burned, but it wasn t. I have a small lump under my jaw which started last week and was sore.It is not sore any more, seems to be smaller.