I have had a white painful line in my mouth for almost a year been to multiple doctors but it remains a mystery i have herpes 1 and 2 so rheumatologist has been treating me with valtrex and gabapentent but almost a year later and it is now spreading to th

Where in mouth?: This may not be infectious or related to the herpes. I can' t tell for sure but consider lichen planus. Seeing a dermatologist might clarify this.

Need an expert: Please seek care with an oral medicine specialist or an oral pathologist. With the complex history you have most dentists would not know what need to be done. You need a specialist.