Hopefully...the nerve to your face is likely affected by the swelling around it and will settle- let your doc know- it is possible to damage the facial nerve during surgery, just depends where the surgery was. Probs it will settle alone. Bells palsy is the other possiblilty - just co-incidential- your doc will know- give them a call!
Hi - you may not realize that you have posted your quesiton in the Multiple Sclerosis forum - MS is a neurological disease that can also make parts of our body droopy, but I doubt if anyone here can answer your question.
you need to call your surgeon and ask your question there.
good luck.