For the last 10 years Ive had this lump in the roof of my mouth that comes and goes every 1-2 months. If i remember, it started after having sex as a teen. It's not really painful. More bothersome. Its a long lump near the teeth. Always near the teeth, never at the top of the mouth roof. I usually start washing my mouth with Hydrogen Peroxide when it happens and it's usually gone in a week. Can it be a parasite? Some type of std? I've gone to std clinics years ago and always came out negative. Any help? If you click on the link, I posted a picture, so you could get a better idea what it looks like: http://www.99centdrumkits.com/mouth.JPG