An expert-approved guide to a multitasking cosmetic with a wide range of benefits — from clearing congested pores to reducing the appearance of wrinkles.

Tightlining is a makeup technique that involves applying eyeliner to the upper waterline (that thin strip of skin right beneath your upper lashes, where the roots of your lashes meet your eyelid).

We’ve all been there: you buy a new retinol, pair it with your favorite exfoliant, and wake up the next morning with red, flaky, irritated skin. That’s where skin cycling comes in. Instead of tossing ...