Small Risk Of Mostly Temporary Facial Paralysis After Covid Shots Is Vastly Outweighed By Benefits Of Vaccination, Study Finds A large Hong Kong study found an elevated risk of developing Bell’s palsy, a rare kind of facial paralysis, after receiving the Sinovac Covid shot but no “significantly increased risk” with Pfizer’s shot, stressing that the benefits of vaccination outweigh the risks of contracting Covid-19.