In my case, no, they never go away. I have been cutting and burning for 16 years, I have a lot of scars, and sometimes I wish I could make them go away, because I know people stare. Mine are mostly on my arms. I tried Mederma. I used it three to four times a day for six months, and nothing happened.
For some people Bio Oil works. And I know that you can have them removed with laser treatments, but that's very expensive. Not an option for me, I have too many scars. The other thing you can do is use body makeup, you know, the waterproof kind that celebreties use to cover up tattoos and such. It's called camouflage or something like that. It's fairly cheap, $25. I've been thinking about ordering some, but I can't right now. You can look up the website.

The best thing to do of course is not getting any more scars in the first place. I know, easier said than done. But seriously, quit, now, while you still can. It WILL get worse.

Good luck to you and I hope this helped a little.