I have had a few occasions since I was about 10 years old (about four times total), where I have broken out in severe hives all over my body for no reason, and had to get medication for it. But it wasn't until about three years ago until I first started to notice any frequent-occuring type of rash, that a lot of lupus sufferers experience. Knock-on-wood, I don't have any daily severe problems with rashes, but for the last few years, I have often had problems with itchiness and patches of redness (from itching) on my legs. Sometimes it has also been on my arms, but mainly always a problem with my legs. The interesting thing is that I never used to have that problem until a few years ago, which was around the time my other lupus symptoms (especially daily severe fatigue and neck/shoulder/back pain) had started showing themselves. I had seen two different dermatologists who only dismissed it as allergic reactions to soaps, laundry detergents, etc., when I knew for a fact (and tried to tell them) that it was not from anything like that. I'm always very aware of using new soaps, detergents, etc., and hadn't at all been doing that, plus I won't put anything on my skin anymore that isn't an all-natural type of product.
Anyway, that is what I have experienced as being part of my autoimmune diseases, but I know everyone is so different.. Hence the reason many doctors (who don't understand about testing for autoimmune problems) want to get you out their door as fast as possible because symptoms can be so confusing and elusive! I wish you luck in finding answers.. Feel free to ask if you have any other questions.
Take care for now,