Stick Pins Through Flesh

This is one of my favorite methods of self-injury because there's minimal bleeding, minimal scarring, and maximum pain (temporarily).  Healing time is fast.  However, you must be sure to sanitize your pins before using them (use either rubbing alcohol or peroxide) and cleanse the wounds thoroughly afterwards with peroxide.  The scar that you can see underneath the pins is from an earlier gash that I'd put in my thigh that had required several layers of stitches (because I had cut all the way through to the muscle and nearly to the bone).