Skin

The skin is the largest organ of the human body and covers almost its entire surface. In adults, it has an average area of about 1.5 to 2 square meters and accounts for roughly 15% of total body weight. It is made up of three main layers: the epidermis, the dermis and the hypodermis. Together, these layers form a protective barrier against injuries, harmful microorganisms, chemicals and excessive water loss.

The skin also contains blood vessels, nerves, sweat glands, oil glands and hair follicles. Thanks to many sensory receptors, it allows us to feel touch, pressure, pain, vibration and temperature, helping the body respond quickly to changes in the environment. Beyond protection, the skin performs several essential functions.

It helps regulate body temperature by producing sweat and by adjusting blood flow near the surface. When exposed to sunlight, it also contributes to the production of vitamin D, which supports healthy bones and other body functions. Small injuries usually heal through a complex repair process involving new skin cells and connective tissue.

Healthy skin depends on good hygiene, a balanced diet, adequate hydration and protection from excessive ultraviolet radiation, which can damage skin cells and increase the risk of skin cancer. Doctors examine the skin to detect infections, allergies, inflammatory diseases and other conditions that may affect both the skin itself and overall health.