In the three years that I have done ultherapy, I have seen bruising in only two patients. Both cases compeltely resolved in less than 10 days. There was only one spot, very small in the first patient and it was over the very bony prominence near the outer corner of the eye, and the company has changed the protocol so that we don't treat near that area since the skin is very thin and there is no fat cushion there. The other patient was treated by a plastic surgeon in my practice and the areas also was over a bony projection of the cheek with very little fat.The good news is this is not a complication, but a rare side effect, and self -limiting.The bruising will not cause a permanent negative result. However, should one be undergoing ultherapy close to a social event during which you'd rather not have bruising, then either reschedule to after the event, or refrain from taking any blood thinners for some time before the procedure. The critical period to abstain from these medicines varies on the actual medication or herbal supplement. Check with your doctor.