Are there any ways to inflict physical pain without causing any kind or serious injuries or scarring? If so, what are they?
Look up a Watenberg wheel. It has sharp pins that make you feel the sensation of being cut, but doesn't cause any harm or leave any marks. They only cost $5 or so. Why are you asking, OP?
>>18699194
Just google torture.
But why would you want to cause pain to people?