The epidermis is the outer part of the skin. It has 4 main cell types which protect the skin which are-
Keratinocytes produce the protein keratin, which provides the skin with physical protection and waterproofing.
Melanocytes are cells which produce the pigment melanin, which gives you colour and protects against UV light from the sun.
Largerhans cells are part of the immune system and are ready to seek and destroy any microbes that may invade the skin.
Merkel cells are deep in the epidermis and provide us with the sensation of touch.
The dermis sits below the epidermis which have two layers the upper ‘papillary’ dermis and ‘reticular’ dermis.
The papillary has a lot of nerve endings whilst the reticular dermis provides the skin with its structural support and elasticity, rich in collagen, elastin and hyaluronic acid.
Collagen is one of the most abundant proteins in the body it forms the scaffold that give the skin strength and support.
Elastin is another connective tissue protein found in the skin as its name suggests elastin gives skin elasticity. it allows the skin to resume the original shape after being stretched pinched or poked.
Hyaluronic acid belongs to a group of compounds known as glycosaminoglycans and also forms part of the skins framework it is essentially a very large sugar molecules with the gel like consistency. It's purpose in skin is to keep it soft, plump and hydrated. Hyaluronic acid is a popular ingredient in skincare due to its moisturising properties but it can also be injected into or under the skin as a form of dermal fillers.