How often is a nerve hit during Ulthera? I heard of a staff member in a doctor's office who's cheek was numb for a few months after having Ulthera. Are nerves and muscles damaged during an Ulthera treatment. Is it just collegen material that is damages and if so how is the treatment limited to just effecting (heating up/burning)collegen and leaving muscle tissue and nerves unaffected by the extreme heat?