Skin treating devices and systems for delivering RF electromagnetic energyto the skin. The devices include one or more electromagnetic RF generating units,multiple RF electrode groups and a controller for controllably applying RF energyto the skin through any selected RF electrode group or any selected RF electrodegroup combination selected from the multiple groups. The electrodes may be stationaryand/or movable electrodes. Different RF frequencies and/or frequency bandsmay be used. The alternation of energy application through different electrodegroups at different times, and/or the changing of the inter-electrode distanceand configuration by using movable RF electrodes may reduce or prevent electrodeoverheating, control RF energy distribution within the skin and enable use ofthe devices and/or for different skin treating applications.
