Hair follicles grow virtually everywhere on the human body and some hairs is so fine they are virtually invisible to the naked eye. Hair itself is made up of a protein called keratin that is produced in hair follicles in the outer layer of skin. As follicles produce new hair cells, old cells are being pushed out through the surface of the skin at the rate of about six inches a year. The hair you can see is actually a string of dead keratin cells.
