ZTo begin with we need to know that the skin is divided into three parts: the epidermis, dermis and hypodermis.
The epidermis is a surface layer of the skin, which is in contact with the outside world. This layer consists mainly of keratinocytes, melanocytes (responsible for tanning) and Langerhans cells (immune cells). This layer has the role to protect our body from toxins, bacteria, fluid loss, injuries and other conditions.
The dermis is located immediately below the epidermis. The dermis is the thick, elastic but sturdy middle layer of the skin. This is where the cells multiply and replace those that have been eliminated in the epidermis. The dermis contains many blood vessels that provide nutrition for the skin. The major components of the dermis are collagen and elastin. These are the connective tissues that provide strength, flexibility and are a vital part of a healthy skin. These components are embedded in a gelatinous substance containing hyaluronic acid and have a high water holding capacity and help in maintain skin volume.
The hypodermis is the deepest layer of the skin. This layer is rich in fat and blood vessels. Its role is to absorb pressure which is subjected to skin and it also protects against changes in body temperature.