I recently used xeomin instead of botox. I have been running a fever on and off for ever since. Can xeomin cause this?

Xeomin is typically very safe and should not cause a fever to occur. Contact your doctor immediately if fever persists or signs of inflammation or irritation exists around injection sites. If you are allergic to any ingredient in Xeomin such as botulinum neurotoxin type A, human albumin, or sucrose, stop using Xeomin.  

However, fever is part of the constellation of symptoms.  However, if your symptoms have persisted for more than a week, I recommend seeing your personal physician for an assessment.  It may be that something else is going on and this needs to be ruled out.  The flu like symptoms, which are described in about 2% of patients, commonly only last a couple of days.