Raddant, hi & welcome. One of my books has old-fashioned reco's for SLE mouth ulcers. (1) Buttermilk gargles. (2) Hydrogen peroxide diluted in a few ounces of water, gargled & spit out several times a day.
Another is Orabase dental gel, a topical steroid (a drug store item, I think).
If those don't help, I'd probably ask my dentist & doctor to check the sores, on the chance they could be something else entirely.
The author says that systemic meds, like antimalarials and steroids, also help oral ulcers, but a formal diagnosis would be needed (duh, obviously
I bet many here can appreciate your wanting & yet not wanting the diagnosis. But please know that proper treatment and follow-ups can make such a difference in the quality of life, and can lower your odds of serious complications. Plaquenil (antimalarial, the lightest class of meds) has helped me. I still have pain & fatigue remaining, not as bad as before; but my nastiest problems, that stopped me cold, have been well-controlled.
Is this your first round of tests, or have you been tested before? I hope you keep posting! Sending my best wishes, sincerely, Vee