i have used everything from a piece of plastic, to a razor blade, to a piece of broke glass and alot in between. & do you mean like a skin reaction? most of the time theyd just swell up get real itchy n bleed. sometimes in a couple days theyd get infected.

i have used:
-steak knife
-pencil sharper blade(my tool of choice more often than so)
-a razor blade
-a piece of glass
-and even my bra connects in the back (the things you use to hook up), in the hospital, i had to bite on them forever to get them sharp
i don't really get shocked anymore, because i don't shock myself. i known a girl in the hospital that has used a sharpen plastic fork. or a pencil (for a while it gave me the shivers, but i got used to it)

i used to use my dads little mustache scissors but i just found a razorblade i use that now, and anything else i can find that is sharp

-a pencil sharpener blade is my normal tool
-staples
-x-acto knife
-glass
-scissors
-pins/ sewing needles
-thumb tacks
-knife
-in desperate situations a paperclip

i use a pocket knife a lot, but also razors, broken sharp pieces of metal, i've used my nails and plastic, and even a pumis stone. i just rubbed the stone back and forth until i had a good gash. also i've used needles and in the hospital a plastic knife. there's nothing i wont use if i can just get to blood.

i've used nail clippers, safety pins, razors, paper clips, chairs, tables, door hinges, tacks, nails, corners of desks/cabinets/drawers, and a plastic knife in the psch. ward at the hospital......i've self injured in safety rooms and in the psych. ward so the chairs, tables, drawers, door hinges and corners come into play......everything else is basically at home....