Reddit mentions of Step by Step Treatment of Acne Scars

They look like boxcar scars. I would read about the different procedures used to treat atrophic acne scarring, starting with this summary of Niti Khunger's book (which I recommend) Step by Step Treatment of Acne Scars.

Medium depth chemical peels and ablative lasers can soften boxcar scars, but won't remove them completely. Other techniques include various kinds of punch-excision:

(From the summary link above)

Punch excision techniques (Level B)

These techniques are utilized for depressed scars such as ice pick and boxcar scars. According to the diameter of the scar, a biopsy punch of appropriate size is used to excise the scar.

• Punch excision and closure: If the scar is > 3.5 mm in size, it is excised and sutured after undermining, in a direction parallel to the relaxed skin tension lines.
  
  
• Punch incision and elevation: If the depressed scar has a normal surface texture, it is incised up to the subcutaneous tissue and elevated to the level of the surrounding skin.
  
  
• Punch excision and grafting: Depressed pitted ice pick scars up to 4 mm in diameter, are excised and replaced with an autologous, full-thickness punch graft. The donor site is commonly the postauricular region or the buttock. Care should be taken to avoid cobblestoning, which is a common complication.