t know how much this will help, but I have had
lupus for about 20 years. I was told by my rheumatologist that
lupus is one of many autoimmune dieseases, no one really is sure how they are contracted, but it is a predisposition which often causes all such diseases. In my case, it came from my mother's side of the family. I don't think you could get it from an injury, since it originates from your own immune system.