The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature. 
As the body’s largest organ, skin protects against germs, regulates body temperature and enables touch (tactile) sensations. As we all know that the skin protect the body, we should also know we should maintain it