A direct current application device includes a direct current source or an appliance configured to be linked to a direct current source. A first electrode is configured to be connected to the direct current source. The first electrode comprises a plurality of needles comprising 3-12 needles which are configured to comprise an electrically conductive connection with each other. A second electrode is configured to be connected to the direct current source. The second electrode comprises a flat electrode, a needle, or a plurality of needles which are configured to comprise an electrically conductive connection with each other. A current device is configured to maintain a current at a constant level during an application of the direct current, or a battery as the direct current source.
