3. When should someone start acne or scar treatment? Answer: Treatment should begin when acne becomes frequent, painful, or leaves dark marks and pits, as early intervention prevents deeper scarring and long-term skin damage. 4. What are the common types of acne scars? Answer: The main types are ice pick scars (deep and narrow), rolling scars (wavy depressions), boxcar scars (broad and deep edges), and pigmentation scars (dark marks).