A brief overview of skin biology related to cosmetics

The biology of your skin tells you a lot about how you should be treating it, including what type of cosmetic products you should be using and why they may work. I find diagrams the easiest way for me to piece together physiology type information. As a result, I put together the following diagram to give you a better picture of the important things related to cosmetics in skin biology. I know this diagram is a wee bit sciency, but if you just bear with me and read through all the paragraphs, you'll come to a better understanding of the skin you live in :).