Some compare the skin barrier to parched, cracked desert earth—dry, fragile, and in need of repair. Call it what you like. The point is, a strong barrier is essential to healthy-looking skin. It helps keep moisture in and potential irritants...
Dear Internet: no, they don't. Here's what's actually happening. Retinoids do not thin your skin. They thin the stratum corneum — the outermost layer of dead cells — while thickening the living epidermis and dermis beneath it. The myth confuses...