Acne scars are the result of inflammation in a pimple or a cyst. Inflammation causes a rupture of a follicular wall which further destroys healthy skin tissue creating a scar
When acne clears, the body tries to repair this damage, In the healing process the body produces collagen a substance that gives the skin support. If the body produce to little or too much collagen, you will see a scar.
It is also depends on Acne severity and acne frequency
Treatment:-
Chemical peel:
Your doctor applies a chemical solution to the scar tissue to remove the top layer of skin and minimize the appearance of deeper scars. Requires repeated sessions.
Steroid injection:
Injecting steroids into some types of raised scars can improve the appearance of your skin.
Skin microneedling:
Your doctor rolls a needle-studded device over the skin to stimulate collagen formation in the underlying tissue. It’s a safe, simple and possibly most effective technique for acne scarring. It has minimal risk of discoloring the skin.
Laser resurfacing
Skin resurfacing with co2 laser gives good results in many acne scars and it requires repeated sessions.
Dermabrasion
Reserved for severe acne scars.
need repeat treatments.
Surgery.
Using a minor procedure called punch excision, your doctor cuts out individual acne scars and repairs the wound with stitches or a skin graft. With a technique called subcision, your doctor inserts needles under the skin to loosen fibers below a scar.