Self-Mutilation Scars on Arms

I'm a 20 yr old young lady and I've had a rough childhood. One of my arms (upper and lower) have self-mutilation scars (from both cutting and burning) in extream amounts. Some are raised, some are discolored. I would really like to make these scars less visible, this would really help improve my future. Are there any treatments that would help? What would be best?