The present invention features a method of treating acne or rosacea on the skin by applying electricity to skin in need of such treatment wherein said electricity is generated by a first conductive electrode in electric communication with a second conductive electrode, wherein both the first conductive electrode and the second conductive electrode are in ionic communication with the skin, wherein the difference of the standard potentials of the first conductive electrode and the second conductive electrode is at least 0.2 V and wherein the electrons that pass between the first conductive electrode and the second conductive electrode are generated as a result of such difference of the standard potentials.