Of course it is possible. But there are many factors to consider both for safety and application. Too much to try to do it here. A brief tidbit is that the body is essentially a capacitor. AC has an easier time travelling through the body than DC. DC requires more current to harm someone, but usually results in burns and muscle lock. AC at low frequencies requires less current to cause damage and is especially dangerous if it is passed across the heart (hand to hand.) Any design you made would have to use a high frequency, be VERY VERY stable in current in the single microamps range, and use conductors that didn't irritate the skin.
A project like this crosses many different disciplines and would require very robust and high-precision electronics design. So it is not as simple as just putting a wire on the skin.