Why we love it: This unbelievably-priced drugstore serum uses 2 percent salicylic acid to both treat existing whiteheads and help prevent them by keeping your pores clear. You can use it as a first ...

Why we love it: Tranexamic acid is an unsung hero of treating hyperpigmentation. It's "a gentle and effective way to improve the look of dark spots," says aesthetician Ivey Rogers. "It helps fade ...