Thanks for your query, I have gone through your query.
Since you are on many medications and systemic illness you need to take lot of precautions.
Regarding SLE, You might have been put on
steroids so the doses might have to be altere.
Regarding
factor V Leiden, is a hypercoaguability disorder, that might result in blood clot in circulation and cause
thromboembolism.
Regarding Xarelto, is a blood thinner, Before extraction of the teeth this drug might have to be stopped after taking physicians consent since the adverse effect of this drug includes bleeding complications, including major bleeding events and
fainting.
Consult a good oral maxillofacial surgeon and get the tooth removed. Before that get your complete blood investigations done including BT, CT, and INR.
If the INR is normal then no need to stop xarelto.
The procedure has to be done as less traumatic as possible. You need to take prophylactic antibiotics before the procedures.
I hope my answer will help you, take care.