Skin is the body's largest organ and it's our first line of defense against foreign invaders like microbes and environmental toxins. More than any other part of the body, this protective outer layer is exposed to damaging environmental conditions like the winter weather that leaves skin dull and dry. Fortunately, skin is always repairing and renewing itself, and we can support that natural process. With summer just around the corner, it's a good time to give our skin some extra special care. These seven steps will get you started.