Best treatment to remove scars from IV drug use

I am a former IV drug user. Light brown skinned African American. I recently entered treatment and stopped IV drug use. During that time I would often IV cocaine and heroin (speedball). Now I am left with these awful scars from missed injections. What treatments should I consider? I have recently started exfoliating, using Mederma, coco butter and Ambi fade cream. All over the counter products from the store . I am not sure how effective they are yet because I just started using them.