Hi Mom, I'm so sorry you are having a flare. As for the lump, it may be swelling from the rsd, but I agree with Bram. I would go to the dr asap just to make sure that it's nothing else than that. I know it's hard, but try to think that it's nothing serious. I had all kinds of weird things happen to me since I've gotten rsd. I woke up yesterday with a rash under both of my arms. I think its just dry skin, but it burns and is spreading down my sides. I've never had that before. But I'm trying not to panic. I will check with my dr on Monday just to make sure it's nothing serious. Just try to hang in there and get some rest. My thoughts and prayers are with you. From your friend, Renee.