how long can anyone keep pinning sub -q 3xdaily without having scar tissue or anything,because this is only my second week,and i find it hard to see where i pinned before,where else is there,i dont want to do quads,ihave read some horror stories about pinning them,someone said once you have used up one area not to go back for about 4wks,i am lean so its difficult.any help appreciated.