Honestly I would say that there would be no need to have a medical alert bracelet since Lupus is a chronic disease that could attack any part of your body. Now, if you have seizures or heart trouble (for example) you may want to get a bracelet for that so if you pass out in town they would have an idea of what may be wrong. The other thing I would suggest is having a list of meds in your purse or billfold where it is easy to find. We are on some crazy meds and they can have a bad reaction with other medicines the hospital/ EMS might give you.
That is just my opinion not a steadfast rule