The invention relates to a device (1) for detecting a movement of a cosmetic end piece connected to an electrical generator (10) and comprising an electrode (2) intended to be moved over the skin (100), a counterelectrode (3) and a microcontroller (11) connected to the electrical generator (10) and capable of applying a controlled electrical input signal Uin(t) to the electrode (2), the device comprising a sensor (4) that is capable of measuring a detected electrical signal Udet(t) between the electrode (3) and the skin and of sending the detected electrical signal Udet(t) to a subtracter (5) which measures any distortion 5(t) between the detected electrical signal Udet(t) and a reference electrical signal Uref and provides, as an output, a zero exploitation signal to the electrode (2) if the measured distortion 5(t) is greater than a predetermined threshold voltage Uo.
