How do i get rid of or radically reduce the appearance of self harm scars?

Bio oil or perhaps try Aloe Vera? I would try and approach the long term emotional issue as to why you feel you want to cut yourself as that is the only way it will stop. It is good that you have stopped it though. My sister does it quite a lot and it is worrying. She is a student at the minute and under a lot of pressure so I'm keeping a close eye on her.