I believe nose sores are related to SLE, IBD, and other autoimmune problems. I get them too, but only on mtx--I think it's a side effect of mtx. Are you currently taking mtx? They sound extremely painful, and I know the few that I have had are real pains.
Current dx: Rheumatoid Arthritis
Suspected dx: UCTD/Early Lupus
Current Meds: Enbrel, Plaquenil, Aciphex, Ultracet, Zyrtec, Allavert-D, Zantac, Tylenol PM
Past Meds: Relafen, Vioxx, Mobic, Voltaren, Sulfasalazine, Entocort, Prednisone, Humira, Reglan