I don't suggest trying any of these but I know you probably will research it anyway so here we go ...
Things that are classfied as self harm with out being dangerous is anything that is harming your body without being a serious harm.
things include
[edit]
Well that is all i can think of that is extremely rarely dangerous ....
I know how much self harm can suck ( the cravings, temptations& urges). so
Pm me anytime xx