Only the skin on the palms of the hand, soles of the feet, ends of the fingers and toes, umbilicus and parts of the genitals is without hair.
Hair conserves heat by trapping air to form an insulating layer.
It has no nerve endings, so although the skin hurts when hair is pulled, there is no pain when it is cut. This is why there is a limit to the length hair can grow, and why dead hairs frequently appear on hairbrushes and combs. Healthy adults normally shed between 50 and 100 hairs each day. The condition of the hair and scalp, reflects the general well-being of the body and mind. The hair usually regrows, but the colour may be different.