There is a product that is a silicone patch, very smooth that can be worn over a scar to smooth it out. You can buy them in drugstores.

However if this scar is on your penis just try to be happy it doesn't hurt when you are erect. Sometimes they do. I have a couple that sting sometimes when I get erect. Not from a trama like you had, I know that adds to the distress. Maybe it would help to talk to someone you trust. I definately wouldn't approach any kind of surgery there. Believe me I have had some and it never turns out better on genitals unless the surgery is perfect. On top of that there is loss of sensation that takes a couple of years to come back and is never the same.