As with any dermatologic procedure, Ultherapy requires sufficient training and expertise that is obtained over years of practice. No matter how thin your face is, the result of Ultherapy should be a slight but noticeable lift and tightening of the skin, plus the stimulation of elastin and collagen production that should keep your skin looking youthful and plump some time after your procedure. Micro focused ultrasound is not optimized to destroy fat, so that would not me my concern as much as going to someone who will recommend the appropriate treatment plan based on your face, because sometime in a thin face a more radical lift can be achieved with correct filler placement. Schedule an appointment with a board-certified dermatologist to learn how Ultherapy can restore youth and elasticity to your face.