My acne scars last a long time. What kind of treatment would be best for me?

I am concerned because whenever I get acne, red or brown marks tend to linger for a long time even after it subsides. In particular, since old acne scars overlap on my cheeks and chin, my skin tone looks uneven overall, and it bothers me a lot because the marks aren't completely covered even with makeup.

So I am thinking about getting a dermatological procedure, but I am wondering which treatment is most effective for acne marks. I looked it up and found that there are various types of lasers, and since the appropriate treatment varies depending on whether the marks are red or have brown pigmentation, it is difficult for me to decide which one to choose.

I am more concerned about the discolored marks than the deep scars.

So, in this case, what kind of laser or procedure would be best? I am also curious about how many sessions are typically required to see noticeable improvement. Since I have skin that occasionally gets new breakouts, I would like to know if there is a possibility that the procedure could irritate my skin or worsen my acne. I would also appreciate it if you could let me know if there is any downtime after the procedure, such as redness or scabbing, that would interfere with my daily life!