With several levels of intensity, you are able to adjust the suction, massage, and heating power of our devices with ease to help you become comfortable with out devices at low levels before progressing. Starting at a low level is the most optimal for beginners and does not hurt or cause permanent skin damage. However, with extended use you may notice the classic red cirlce bruises on your skin, this is te temporary and indicates the effectiveness of our devices. These marks will gradually disappear within a few days and are nothing to worry about!