Many people experience a tingling/stinging feeling, like when you put your tongue on a battery. Most people describe this as a mild discomfort but of course everyone is different. Start with a low voltage and increase gradually, if tolerated. Make sure you do not have any wounds or cracks on your skin. Minor wounds can be covered with a thick layer of Vaseline. Otherwise these areas might hurt. Using a pulsed current can decrease any discomfort.
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