I was patch tested recently and just got the results back. It turns out I am allergic to gold! My derm says that she has seen a link between gold allergies and LPP. She asked if I had oral problems with LPP and if I had gold dental work. I do have both. She asked when I got the gold crown. It turns out that it was about the time I had my first flare with LPP although I didn't know that is what I had at the time. She strongly urged me to have the gold crown removed.