Do go see an oral surgeon. and ENT world be preferable - though one who specializes in oral cancer is the king you need. Feel free to vent here. Dentist if they are experienced and have seen oral cancer are a good starting point but you really need a good ENT. Did he say any thing else about your Parotids? They are behind where you described your ulcer as being, bu what he was saying may have a bearing in term o a possible glandular infection. Please don't wait too long to have your cheek checked ou I don't know if it's cancer but, probably not, but it will ease your mind to know whats up... Good luck!