The skin is the largest organ of the human body. Its main functions are protection, thermal regulation, and sensation. Our skin matrix refers to the complex and layered structure of our skin, which is made up of three main layers: the epidermis, dermis, and hypodermis (or subcutaneous layer). Each layer of the skin provides unique and distinct functions. The three layers of the skin are: 

Epidermis
The epidermis is the top, or visible, layer of the skin and is made up of four (in some locations, five) layers.

Skin cells develop in the bottom layer of the epidermis, then change form and function as they migrate toward the skin’s surface where they eventually shed as dead skin cells. This migration (a process called desquamation) takes approximately one month but varies person to person, with this process slowing as we age. While thin in comparison to the other skin layers, the epidermis is incredibly tough and provides an exterior barrier that keeps essential moisture in and external matter out. It is also home to melanocytes which are responsible for melanin production and pigment formation.