I have what is like a blister on my gum. It is not really sore and I tend to just burst it. It does seem to keep coming back though. I was at the dentist last month (just check up) and they x-rayed my mouth (not linked to this) and did not pick anything up.
Thanks for your query, I have gone through your query. The blister on the gum could be because of the recurrent herpes virus infection, or it can be because of the Memphis vulgarism. Consult a good oral physician and get it evaluated. If it is a viral infection, you have to take antiviral Chat Doctor. If it is Memphis, you have to take topical steroid like triamcinolone acetone 0.1% 4-5times daily after food. I hope my answer will help you, take care.