Thank you for your question.
Xeomin cannot cause a fever. What we do find is that those that coincidentally get ill post injection find their toxin does not work as well on that occasion.
In the absence of any other information as to your symptoms an on/off fever is potentially a concern - you need to see a doctor or visit your local Emergency Department if feeling really unwell.
I hope you get well soon
Dr Dinesh Maini
Zenith Cosmetic Clinics