Despite exercise and dieting, localized fat deposits may persist. These areas are the result of family traits or gender, rather than an unhealthy lifestyle. Liposuction removes fat deposits resistant to diet and exercise, improving body contour and proportion. Ultrasonic liposuction is used to promote skin retraction and liquify fat for easier removal. Common areas where liposuction is performed include the chin, neck, back, abdomen, flanks, inner and outer thighs, buttocks, knees, and upper arms.