When you look in the back of my throat I have like a dark red line thst forms a rain bow from one side to the other. The smooth part surrounding my esopogus..behind molars you see when u open your mouth. I have a constant burning. No sore throat when I swallow...just all day long sore throat in thst area. Did a rapid strep test neg. Waiting for culture to come back. But it burns and nothing is helping. It has gone on for days and I am starting to freak out. dr said she had never seen before.