A couple days ago my lower lip on the inside started to feel raw like I had bit it or hand been chewing on it. It hasn't gone away but gotten slightly worse, like if I smile and the skin stretches it hurts. Almost a slight burning sensation on the corners of my mouth as well. I've been using hydrogenperoxide with water to keep it clean and lots of vasaline on my lips so they don't get dry. But unless I use the oral jell it hurts. What could it be? And how could I get rid of it?