How to get rid of severe post inflammatory hyperpigmentation thighs/buttocks/back/upper arms?

I’m seeking trustworthy advice for Post Inflammatory Hyperpigmentation. The marks are from constant skin picking which I’ve now managed to stop. I’m using lactic acid, Alpha-H liquid gold, rosehip oil, s5 illuminate serum. Considering paying for some laser treatment but heard this can make the problem worse depending on the type.I’ve heard of Hydroquinone and azaelic acid but scared to make anything worse. Is there anything to remove the scars? I have type 3 pale olive skin. Thankyou in advance.