Paintball was fun but can lead to scarring. I got a scar on my bicep from one, it finally faded 10 years later and another one, my 2nd time playing.

I covered up much better but got hit on the finger and received a ball-shaped scar (it also faded since then). I don't think it's common but possible if you have thin skin.

That being said, I don't think it's a great idea to increase the pressure on the gun.