46 YO white female. I awoke on Monday morning with about a nickel-sized open sore on my left elbow and is still present today. There is no HX of injury and it was not there the day before. It immediately woke me up at 6AM as it felt like there was a shard of glass in my arm when I went to turn onto my left side. Bothers me when it brushes on my shirt. I have been DX with MS, Lyme Disease and Hashimoto s Disease. However, my last neurologist questioned the MS DX as said he didn t see it on my most current MRI; my family dr said if it was MS, I would have permanent disability by now, which I don t. Discussed poss of lupus with my family dr, and she said she would test for it at my next flare. Am concerned this is a lupus sore ????