The skin of human beings usually has very small hairs on it that are hard to see. Some people have more hair, or hair that is easier to see, and some have less. People have hair that is longer and easier to see on some parts of their bodies, such as the tops of their heads and men's beards. The skin is actually the largest organ of the human body. Without our skin we would easily get infected with diseases. Keeping it clean is important to health, and skin care is a big industry.