look up GLOSSODYNIA also try yogurt and pro biotic Asidophilus itis a capsule of thegood bacterias in yogurt you can get it in any drug store
I have had the same thing since March, shortly after a sexual encounter. I've seen various doctors, my dentist, dermatologist, and an oral surgeon. All of my test results have been negative. I was not tested for Herpes or Hepatitis because none of the symptoms seem related. The white fungus/bacterial looking stuff gets worse when I drink coffee or beer. It also causes a stickiness or slight burning on my lower lip at times. Over the last few months it seems to be less irritating but I was using chapstick on a regular basis for a while for relief. I also developed a few small blemishes on my face that look like blood vessels. Nothing major but I wonder if they are related. Personally I know that something changed in February/March and I'm not convinced that there isn't something wrong. Whether it is a normal condition or something rare that could possibly be cured is the question. Be prepared to hear the same response..."There's nothing wrong with you". Aside from being tested, I've done a lot of research and ruled out HIV.
I think the doctors would have noticed if it was thrush and I think it would be present in other parts of your mouth. I would continue with the hygiene you are using and see how it goes. If it persists see an oral surgeon for a consult.