A device for carrying out a cosmetic method or treating skin ageing and the method comprising the following steps: a) connecting an electronic device, able to generate high frequency electric current waves having a distorted sinusoidal wave form by the presence of harmonics, to one or more electrodes of essentially laminar shape b) applying said one or more electrodes on the skin surface in the area to be treated c) activating said electronic device in order to transfer said current waves to said one or more electrodes and to maintain said device activated for a predetermined time d) deactivating said device and removing the electrodes form the contact with the treated area.
