We mean the basic care and keeping of your largest organāyour skin! It plays an important role in protecting you from outside pathogens and, you know, holds all your internal organs in place (phew). And in the same way that you regularly brush your teeth, your skin requires at least some attention to keep it functioning properly. It also requires protectionāespecially from skin cancer. At SELF, when we talk about skin care we're talking about science-backed ways to improve both the look and function of your skin to address and manage both cosmetic and medical concerns.This guide is for anyone who is curious about what it means or what it takes to have an effective skin-care routineāfrom beginners who don't know where to start all the way to seasoned skin-care enthusiasts. Consider it our ultimate skin-care manual.