It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
An online health information resource from the U.S. National Library of Medicine. Provides the latest health news, a medical encyclopedia, videos, and tutorials. Go to "Health Topics," then "Find topics A-Z" to find "Skin, Hair, and Nails" or "Cosmetics."