It's never worked at all for me. Every company puts it in their product, and even the high end brands. Each time I tried it, it made my PIH way worse, more prominent and it took longer for it to fade. And it did absolutely nothing for my acne. It's so ridiculous how overrated the stuff is.

I don't like it at low concentrations, but a 20% or higher salicylic acid peel can do wonders for closed comedones and stubborn blackheads.

But anything less than a peel, I find it ineffective, and just irritating enough to my skin to be unhelpful.