A non-invasive treatment device for heating a first inner region and a second inner region of skin using radio-frequency (r.f.) electrical current, the second inner region being at a deeper location in the skin than the first inner region, the device comprising: - a first r.f. treatment electrode configured and arranged to allow r.f. electrical current to pass through an outer surface of the skin and through the first inner region; - a return electrode configured and arranged to allow r.f. electrical current to pass through the first inner region and the outer surface of the skin; - a first r.f. generator configured and arranged such that, in use for heating the first inner region, a first r.f. current is applied through the first inner region between the first r.f. treatment electrode and the return electrode operating in bipolar mode; - a second r.f. treatment electrode configured and arranged to allow r.f. electrical current to pass through the outer surface of the skin and through the second inner region; - the return electrode being further configured and arranged to allow r.f. electrical current to pass through the second inner region and the outer surface of the skin; and - a second r.f. generator configured and arranged such that, in use for heating the second inner region, a second r.f. current is applied through the second inner region between the second r.f. treatment electrode and the return electrode operating in bipolar mode; the device further being arranged such that a smallest distance between the first r.f. treatment electrode and the return electrode is less than a smallest distance between the second r.f. treatment electrode and the return electrode; wherein the first r.f. treatment electrode, the second r.f. treatment electrode and the return electrode each comprise an electrical skin contact area, a maximum dimension of the first r.f. treatment electrode proximate the electrical skin contact area (350, 450) of the first r.f. treatment electrode being less than or equal to 1 mm, and the electrical skin contact area of the return electrode being 5 or more times larger than the electrical skin contact area of the first r.f. treatment electrode, characterized in that the electrical skin contact area of the second r.f. treatment electrode is 5 or more times larger than the electrical skin contact area of the first r.f. treatment electrode, and that the device further comprises a controller to selectively activate the first r.f. generator and the second r.f. generator either separately or alternately. - a first r.f. treatment electrode configured and arranged to allow r.f. electrical current to pass through an outer surface of the skin and through the first inner region; - a return electrode configured and arranged to allow r.f. electrical current to pass through the first inner region and the outer surface of the skin; - a first r.f. generator configured and arranged such that, in use for heating the first inner region, a first r.f. current is applied through the first inner region between the first r.f. treatment electrode and the return electrode operating in bipolar mode; - a second r.f. treatment electrode configured and arranged to allow r.f. electrical current to pass through the outer surface of the skin and through the second inner region; - the return electrode being further configured and arranged to allow r.f. electrical current to pass through the second inner region and the outer surface of the skin; and - a second r.f. generator configured and arranged such that, in use for heating the second inner region, a second r.f. current is applied through the second inner region between the second r.f. treatment electrode and the return electrode operating in bipolar mode;