I have an ulcer on the roof of my mouth whichs bleeds somewhat profusely when I expectorate after brushing my teeth. My dentist thought canker on a blood vessel or the emergence of a bony protrusion . I took antibiotics and it appeared to be almost gone in a week. Stopped the antibiotics, it came back. Prior to its coming back though, I had sinus pressure on my right side and a minor headache. It feels as if my sinus is draining through the roof of my mouth. Once the bleeding started, there was no more pressure. Any ideas?
it is sinus infectionpost nasal  ChatDoctor.