Healing is a complicated process. As people age, higher rates of disease and the fact that old cells lose the ability to divide slow this process down.
When kids get injured their skin heals fast, but usually with nasty-looking scars. Now scientists studying the genes of old mice have figured out how they regenerate skin and block scars.
People with visible facial differences, such as acne, are rarely represented in the media and when they are, they are often vilified.