Ultherapy is extremely safe when considering the number of cases performed since its evolution. The deep ultrasound has been reported to cause self-limiting, non permanent tingling, soreness, numbness, muscle weakness, brusing, swelling, tenderness. These are more side effects than complications. A weakness of the motor nerve, such as the marginal mandibular nerve at the front of the jaw has been reported to cause a couple of weeks of inability to lower the corner of the mouth when smiling. Soreness or tenderness in the scalp from forehead ulthera or over other areas such as the cheekbone can occur. I am not aware of any permanent problems. Theoretically there is a chance of a skin burn but most doctors have not seen this. This may not be a complete list of side effects so discuss this in greater detail with your doctor when considering having Ultherapy.