A good rule of thumb for treating scars of any kind is that if it is depressed (i.e. atrophic, sunken, indented, crater-like), raise it up. And in this case, subcision lifting would be a good, relatively inexpensive first choice. If combined with the injection of a biostimulatory filler, such as Restylane Lyft (which I would use in my Upper East Side Manhattan office) or Hyaluronica 2 (my go-to for this in my Israel satellite facility, where a far greater number of regulatory agency approved fillers are available), the results would be immediate and, due to the extra stimulation of new, native collagen synthesis, would likely be even more gratifying in the long run. I would exercise caution if considering laser treatments and the use of PRP, as these relatively expensive treatments have a lot of industry supported marketing hype to back them up, but much less hard science. Best to see a board certified, aesthetic physician with experience and expertise in all forms of scar treatments.