I'm curious about the effects and precautions of pigmentation laser!

After fighting acne, I was left with red and black pigmentation on my face as a aftereffect due to carelessness.
Every time I look in the mirror, I feel upset and my confidence drops because of my bumpy, uneven skin, and that's stressful.

Eventually, after doing some research to solve this problem, I was recommended to try laser treatment for pigmentation.

I've heard that laser toning or combination treatments can improve pigmentation, but since it's a facial problem, I'm worried about whether it will be as effective as I want and whether I should worry about other side effects.
How many treatments would I need to see improvement in deep, dark post-acne pigmentation with a pigmentation laser?
Also, I am wondering if I should be concerned about any other side effects after the pigmentation laser treatment.
I would like to ask for your review or advice on what special precautions should be taken before and after the procedure, and whether it is possible to forget about pigmentation after receiving the pigmentation laser.

I want to go back to clear skin

ㅠ.ㅠ~~!