I have treated over 400 people with Ulthera. It is a VERY safe treatment, however it is true as P13_ski stated ALL treatments have risk. Over all the Ulthera has been extremely safe for most people while giving a great result. To address Antoniag, the tranducer can cause "welts", they are raised areas on the skin about the size of a pin scratch. They will subside on their own in a few days and are caused by the tranducer not being in correct contact with the skin. I have had this with a few patients. I have found if you point them out and explain what they are everyone is fine with it. Overall we have found the Ulthera to be a great safe treatment.