The skin is an indispensable structure for human life. Because it forms a barrier between the internal organs and the external environment, the skin participates in many vital functions of the body.
The outer surface consists of stratified layers of dead, "keratinized" cells that form an effective protective covering against the penetration of noxious substances from the outside environment. The protective function is further enhanced by the oily and slightly acid secretions of the sebaceous glands, which discouraged the growth and multiplication of many harmful bacteria.
Underlying this tough outer layer or the epidermis are the dermis and subcutaneous tissues that, far from being homogeneous, are composed of a multitude of tissues, which are supported and maintained in proper relation to one another by means of fibrous and elastic connective tissue.
Obviously, the skin, rather than being a single organ, consists of groups of organs, each responsive to its own particular stimulus, and each vulnerable to any harmful influence that would threaten it elsewhere in the body.
Once these so-called harmful influences had taken so much effect in the skin, the resulting product would be numerous dermatological problems like wrinkles.
Although wrinkles are more associated with the dermatological clock of the skin, it is still considered as the resulting product of the greatest effects of harmful influences in the skin. One of which is the damaging effects of the sun. Prolonged exposure to it can prematurely age one’s skin.