My 2 yr old developed a facial palsy on one side of her face after she came into contact with chicken pox virus....My child didnt get chicken pox but got a facial palsy...Apparently it is fairly common and people can get it following any type of virus but especially the varicella(chicken pox) virus.....Very distressing to see....but have been told it will take between 2-4 weeks to go back to normal....