Skin is our largest organ and something we may take for granted when it’s healthy. As an academic dermatologist I frequently hear misleading “facts” that seem to be stubbornly enduring. Here are some of the most commonly shared myths that can be cleared up immediately, and some truths you can rely on. Skin constantly renews itselfTRUE The skin provides a dynamic barrier between your body’s internal environment and the outside world. Cells called keratinocytes in the epidermis (the outer layer of skin) are constantly dividing to produce a supply of cells that move up through this layer and are shed from its surface. Skin is a rich source of stem cells with the capacity to divide and renew themselves.