Skin Facts



  • Skin is your protective coat, shielding your body from the weather and from infection, and helping to keep it at just the right temperature.
  • Skin is your largest sense receptor, responding to touch, pressure, heat and cold.
  • Even though its thickness averages just 2 mm, your skin gets an eighth of all your blood supply.
  • The epidermis is made mainly of a tough protein called keratin — the remains of skin cells that die off.
  • Below the epidermis is a thick layer of living cells called the dermis, which contains the sweat glands.
  • Hair roots have tiny muscles that pull the hair upright when you are cold, giving you goose bumps.
  • Skin is 6 mm thick on the soles of your feet, and just 0.5 mm thick on your eyelids.
  • The epidermis contains cells that make the dark pigment melanin — this gives dark-skinned people their color and fair-skinned people a tan.
  • Skin makes vitamin D for your body from sunlight.
  • The epidermis, the thin outer layer, is just dead cells.