my hard palate in my mouth is sore and red on the right side. I'm also having some sinus pain on that side. about three weeks ago i have bad sinus pain on the LEFT side, as well as chest congestion -- took Biactin (sp?) for 10 days, that cleared about. about a week later these new symptoms started. No chest prob now, but the sore in mouth is very painful. I've had cancer sores many times before, this is not that, i don't believe. it could possibly be a burn (but that was almost a week ago). thoughts?