The TCA Body peel serum is truly amazing when it comes to KP AND PIH. With regular use not only was my skin soft and smooth but stubborn PIH on my arms and legs faded significantly. I have used professional laser treatments, KP scrub, dermatologist products, gotten pro PCA body peels regularly and nothing gave me results as easily and cheaply* as continued use of this. I wish it last longer for those of us with more concentrated and more stubborn PIH. ): may begin to use in alternation with the KP scrub and see how that does. But I will continue to purchase this and really think it does a fantastic job. I’m on my third bottle now and purchasing 2 more. And considering the cost of ONE pro laser session for just a part* of my body is 300$ I’m satisfied with price despite wanting more product to cover whole body. Please give it a try. This is a truly sincere review from someone with body and skin dysmorphia. So if you suffer, more than you need to and more than the average person with skin concerns, really, try this product. I hope it helps someone like it is helping me.