Sorry for the late reply.
I have seen your photo, and yes this thread is private, no one on the internet can see this photo other than dental
experts on this website.
Unfortunately, the appearance of the lesion is very non-specific. I would put my provisional diagnosis as:
- simple stomatitis due to a local reaction to a chemical (a reaction to spicy foodstuff or vinegar )
- erosive lichen planus
None of these are dangerous, but will require a biopsy and immunofluoresence testing for confirmation.
If you stay near a dental school, I suggest you visit the Orofacial Pain
department there .A full assessment is required to eliminate any underlying cause.
If not, please see an Oral Surgeon for the biopsy. Meanwhile, do not rinse with salt water. get a local anesthetic gel from the pharmacy and apply it to the lesion.
Hope this answers your question. Feel free to contact me again for more information. Please leave a positive rating for me if this answer has helped you. I do not get credit for it otherwise.
Good Luck !