Yes.  Like all treatments for acne scarring no single type of treatment will take care of all the scarring.  We often use subcision occasionally alone but more often in combination with other treatments like Fraxel, fractionated CO2 laser, fillers, etc.   It really just depends on the exact type of acne scarring ("ice pick," "rolling" or "boxcar" are the most common), where the scarring is on the face and how deep it is.   Dr. I