@pollyann Welcome to Connect. We’re not doctors on this site but we all try to share information and support. What you have mentioned in your treatment of discoid lupus is what is suggested by the lupus foundation. Plus covering up from the sun is so important! I have a different type of autoimmune disease and also need to stay out of the sun because of my medications. Have you seen a rheumatologist? They seem to be the ones with the most knowledge of autoimmune diseases. Did you have a biopsy to confirm the diagnosis? Please stay in touch, someone on the site may have direct experience.
https://www.ncbi.nlm.nih.gov/books/NBK493145/ Check out this website