in reality what happens is that by cutting your skin it is like the second coming of jesus chist near the wound. as if everything in your city was taken off the ground and thrown into space. those who dont get sucked out by the ruptured gravitational pull would be greated by an endless hoard of alien creatures, who only want one thing, to multiply and destroy. and earth seems like the perfect spot to do so.
when you intentionaly cut yourself it shows that you are going through things and what your intentions are. and i know that people dont want their intentions shown. so they hide it behind clothing. hoping that no one wil ever see it. eventualy someone will. what are you going to do then? cutting yourself certainly wont help it.