A device for treating skin includes a skin treatment member, a skin contacting surface, a mounting member for mounting the skin treatment member and the skin contacting surface, and a friction controlling device to control friction between the skin contacting surface and skin to be treated, in at least one controlled friction area of the skin contacting surface when the skin contacting surface is moved over the skin. The friction controlling device introduces a slip motion of the controlled friction area relative to the mounting member in a direction corresponding to a local direction of extension of the skin contacting surface. The device also includes a sensor for detecting a first parameter related to an amount of friction between the skin contacting surface and the skin during use, and the friction controlling device controls a second parameter of the slip motion in dependence on a value of the first parameter.