Lupus Support Group
Lupus is an auto-immune disease in which the immune system cannot distinguish between threats (like viruses and bacteria), and healthy cells and tissue. As a result, the body produces antibodies that inflict cell damage, most commonly targeting joints, skin, kidneys and the nervous system. Join the group and find support for coping with lupus.
http://www.itendonitis.com/causes.html
I know how annoying it is, I too have alot of things re-occuring that are not connected to lupus. Joint pain in all knee hip elbows etc. very frustrating I know but as it is isolated just continue with the recommendations on the site and see how you go.
Sorry I have no great insight for you.
take care Dee