What are the most effective treatments for acne-prone skin that leaves scars and pigmentation?

One of the concerns of acne skin is post-acne scars and pigmentation marks left after inflammatory processes such as incorrect extraction.
The skin is a mixture of sunken scars and red or brown pigmentation, making it very difficult to improve with just regular skin care products.
It's a little late, but I want to reverse the damage caused by acne and restore a smooth, even skin tone.

Considering my current acne-prone skin condition, I'd like to know about treatments that can effectively treat scars and pigmentation issues, either simultaneously or individually.

I'm curious about what kind of treatments are available for areas that remain as scars.

Also, for pigmentation spots that are divided into red and brown marks, I would appreciate it if you could explain what would improve the pigmentation and brighten the skin tone of acne-prone skin.

I would appreciate it if you could let me know of any effective treatments that can help me reverse these two skin conditions.