What Treatment Should I Go For White Blisters?

I have a white blister on my glossopalatine arch it has been there on and off for around two years it is sometimes larger than times but is always in the same place it has now began to be slightly painful like a mild throbbing pain but the pain may be due to the fact that I m more aware and my tongue searches for it regularly, I have a sensitive tooth nearby not sure if this is relevant. I ve seen my GP dentist and a specialist over the two years since it started but due to the nature of it coming and going it has only been seen once by my GP who was not sure what to suggest, it is now present a lot more frequently the specialist did not see it but said I should not worry about it