There is a colorless ridge on the roof of my mouth on the hard palate. This thing has been troubling me for near about eight months now. It occurs occasionally, swells up and burns, and then at the end of the day, it subsides. It stopped for a month, but now again, it comes for like a day and then subsides for two or three days. Please tell me what it is. Currently, for allergies resulting in sneezing and cold, I take Duanose nasal spray.