Hi Jen,
Thank you for your comment. I'm sorry you've had to deal with SH -- in the past and, in terms of urges at least, more recently as you described. You mentioned going to therapy in past tense; it's hard to say from your comment, but it seems like it might have helped, since you were able to stop self-harming for a time. Would it be possible to go back to therapy -- either the same therapist or a different one, if necessary, to discuss your urge to SH returning as well as your concerns about your scars? (I would also urge you to talk to a dermatologist about your scars, if possible.)
Unfortunately, I can't personally tell you much. I'm not a doctor, but even if I was, every body is different, and heals at a different rate. There are also myriad factors that can affect the healing process--way more than we could get into here. All I can say is that generally speaking, shallower and smaller wounds tend to fade more and do so sooner, but there's no 100% guarantee that they will fade entirely. I have very small scars from when I self-harmed more than 10 years ago that are still with me--but they have become almost invisible unless you're really trying to look for them. I also have heart surgery scars from several years ago that are still pretty visible--it's just that I've gotten used to living with them.
The best thing you can do is take really good care of your skin--use good first aid for fresh wounds (keep them clean, don't pick at them, use something like Neosporin if applicable), and practice general healthy self-care, especially skin care, to help scars fade (stay hydrated, eat a balanced diet, and consider using a skin care product like aloe gel or a lotion containing vitamin E, aloe, and/or other things that help reduce inflammation and promote happy, hydrated skin).
I hope that helps.
Wishing you the best of luck,
Kim