The skin is the largest organ in the body. It consists of three layers – the epidermis, the dermis and the subcutaneous tissue. Hair and nails are both modified forms of skin.

The skin serves as the body’s natural protective covering. It prevents germs and other potentially harmful agents from entering the body. It also shields internal organs, muscles, nerves, blood vessels and other structures from the sun’s harmful rays and protects the body from injury. In addition to providing protection, the skin prevents the loss of essential fluids (e.g., blood, water), regulates body temperature and senses painful and pleasant stimuli. The skin is also a minor source of waste disposal and an indicator of health problems.

Because the skin is located on the outside of the body, it is susceptible to a variety of diseases, disorders, discolorations and growths. Most skin problems, however, can be treated by a dermatologist with a minimal amount of pain and risk.