Pigmentation, which treatment is best?

What treatments are effective for pigmentation in acne and boil areas?
hello.
I am a member who is interested in skin care and visits Maypure.

I am writing this because I want to find a solution to the persistent red pigmentation left behind by acne and boils that repeatedly appear all over my face and body.

Even though the inflammation has subsided for a long time, the affected area has turned dark and looks dirty, and I feel that self-care alone is not enough to improve it.

In particular, the area where the boil occurred has deeper and darker scars than regular acne. Can I still see noticeable results with the treatment in this case?
Or I wonder if concurrent treatments like regenerative injections are essential.