I would use a combination of FUE, fat grafting, subcision, fillers, and fractional laser to improve your hair transplant scar.
A deep scar like that may require a combination treatment of subcision to lift the scar and fillers to fill in the depression. Sometimes microneedling/PRP and lasers help improve the texture/quality of the scar. Please see an expert. Best, Dr. Emer.
Thank you for your photos. Generally speaking, depressed scars can be treated mechanically with microneedling or released and "filled" with a filler or grafting. MIcroneedling breaks up scar tissue and allows the body to regenerate collagen overtime with multiple treatments. Fillers can be done without surgery but are temporary and require multiple treatments indefinitely. In this case, I would recommend subcision with fat grafting to help release the scar tissue and restore the quality and surface of the skin. This can create long-lasting permanent results. It is best to have an in-office examination to determine the best treatment plan. Hope this helps!
Johnson C. Lee MDPlastic Surgery