Can the appearance of self harm scars be improved? (Photos)

Thank you for your question.  The CO2 laser skin resurfacing treatment removes deeper layers of damaged skin and stimulates the regeneration of healthy skin underneath.  If you believe you may be a candidate for CO2 laser skin resurfacing treatment, a qualified cosmetic surgeon or dermatologist can carefully analyze your skin and determine if the procedure is right for you.

First, I hope that you are receiving help for your tendency to hurt yourself.  That is the most important issue.It depends upon what you don't like about the scars.  If it is the loss of pigment, that is very difficult, if not impossible to correct.  It is important for you not to tan, since increased pigment in the skin around the scars will make the scars look even more noticeable.  If it is the texture that you don't like, there are several options for improving that.  These include kenalog (a mild steroid) injections, lasers and/or microneedling with PRP (protein rich plasma).  I would recommend that you schedule a consultation with a physician who specializes in aesthetic medicine.Best of luck to you!

Healing process will take approximately 9 months with any skin injury. A safe approach to promote healing is Vitamin E oral and topical, an over the counter cream Mederma is an effective choice as well. 
Good luck

These absolutely can be improved with various laser modalities BUT you must stop harming yourself and if necessary see a psychiatrist. for the scars see a board certified dermatologist

You should look into microneedling. This is a procedure where we create a controlled micro-incision all over a scarred area like this. It helps stimulate collagen and elastin production. This will help create new skin and will very effectively diminish the look of scars.