A treatment system and method for reducing body perimeter, primarily aimed at reducing cellulite and/or fat at a region of treatment. Ultrasound waves and pressure exertion are applied to the region of treatment, preferably simultaneously. The pressure exersion may include manual or mechanical massage, and/or electrical muscle stimulation. An optional ultrasonic transducer head is utilized to apply also pressure and massage. Preferable frequencies and intensities of the ultrasound and the stimulation are also provided.