Skin performs numerous functions and the important ones are:

• Protection: It protects the body from physical, chemical and biological injuries
• Perception: It perceives various sensations like pain, touch, temperature, pressure and vibrations.
• Temperature regulation: Eccrine sweat glands and rich blood supply play a major role in thermoregulation.
• Barrier function: Skin acts as a permeability barrier that regulates the diffusion of substances particularly water and electrolytes.
• Secretory functions: Synthesis of vitamin D3 is an important secretory function which is achieved with the help of sunlight. Vitamin D3 is essential for bone metabolism.
• Storage functions: The dermis and subcutaneous fat act as a storage center of energy and other compounds.
• Excretory functions: Some of the harmful substances are excreted through the skin.
• Immunological functions: Recognition of exogenous substances (antigens) and elicitation of antigen specific cell responses are carried out in the skin.
• Cosmetic function: Color and texture of the skin along with the hair and nails play an important role in aesthetic appeal of an individual.