The treatment with Ultherapy is not supposed to be delivered deeper than the SMAS, which is superficial to (ie above, closer to the skin than) the muscles. The muscles, not the skin, are innervated by Cranial Nerve VII, which is the affected nerve of Bell's Palsy. We do not know for certain the cause of Bell's Palsy, but many believe it to be a virus. With that explanation, Ultherapy should theoretically not be a cause of recurrent Bell's Palsy. We do know that patients can have mild swelling in the first couple weeks after Ultherapy...and that swelling could possibly cause some select patients to have symptoms consistent with a recurrent or initial Bell's Palsy.....but that should all resolve rather quickly, usually within days (if it occurs at all) or a couple months in a rare situation. Cold packs over the treated area could reduce the likelihood of a Bell's Palsy.....but cold packs in the first few days to the treated area(s) after treatment are generally discouraged (as are the use of NSAIDs or other non-Tylenol-based pain relievers) because it is believed the inflammation initially in the tissue helps to encourage an optimal amount of collagen production, to give final better results. So if it happens to you, apply cold packs but not sooner than 72 hours after the treatment.