I had punch excision on an acne scar and was disappointed in the results. I had skin removed from the back of my ear and placed in the area. The only problem is sometimes the graft doesnt survive and dies, but they have to make the initial scar larger to put in the implant. I was left with a larger and more sunken in scar due to the death of the implant.
It is very successful for many people, but that is just a risk. My surgeon (or I should say surgeons since I have seen so many) suggest punch excision followed by dermabrasion for the best results. In some of his other patients the results were amazing