The skin is more than just a bag in which the skeleton and organs are contained. In its own right, it is the body's largest organ. It is the interface between the body and an often hostile environment. The skin absorbs harmful external factors such as ionizing radiation, ultraviolet light, and hundreds of toxic fumes and chemicals, preventing them from entering the body and causing damage to vital organs. It monitors both internal and external temperature changes and adapts to these changes by sweating and through blood vessel dilation or contraction.

The epidermis is the outside or top layer of the skin, and is what you see when you look at the skin. The life cycle of the epidermis is about three weeks long. The bottom layer of the epidermis, which consists of new, rapidly growing cells, pushes up to replace the top layer of dead cells causing them to be sloughed off.

The epidermis protects the skin and is very effective at blocking entry of foreign materials at the molecular level. Pigment cells are found in the epidermis and in the deeper layers of the skin around the oil glands and hair roots. The skin receives its color from pigment cells that produce melanin.

The dermis is the middle layer and contains the foundations or building blocks of the skin. The various components of the dermis are: elastin tissue (elastic protein) which gives the skin tone and makes it supple; collagen (fibrous protein) to provide strength and structure; blood vessels which deliver essential nutrients and remove wastes; nerves which make the skin one of the most sensitive organs in the body , oil glands to lubricate the skin; and sweat glands which regulate fluctuations in body temperature. The dermis is the most vital part of our skin and is the layer where many signs of change are manifested.

A thin layer of fat is found underneath the dermis. it not only provides a protective padding, but also gives the skin a full, healthy look.