Under Your Skin: Layers and Functions of Skin


Reading: 4 protocol

When you hear layers and think of scarves and sweaters or this season’s trend haircut instead of your skin’s complex barrier system – well, that’s pretty understandable. But understanding the basics of what’s going on inside your skin can help you take better care of it.

So we have collected the outstanding facts about each of your skin layers and their processes. Find out how each layer works, how it ages over time and how it can be supported.


Let’s dive in.

How many layers does my skin have?

Your skin is divided into three interdependent layers: the epidermis, dermis and hypodermis.


you can imagine the layers of your skin just like bundling up to go out in a blizzard. Each layer is important and serves a different purpose. And just like your favorite pieces of clothing, each one ages in its own unique way over the course of the seasons.

Starting with the base layer, which helps insulate us, we have the hypodermis. At the center is your thick knit sweater, also known as the dermis, which provides strength and flexibility. To top it off comes the epidermis: the thin, waterproof covering that protects you from the elements.

Let’s find out what remarkable functions take place in each layer and how aging affects these processes.


What are the different layers of my skin?

The layers of the skin

Hypodermis: the lowest layer

First? The proven thermal layer for insulation. Also called subcutaneous tissue The hypodermis acts as an energy store.

This innermost layer consists primarily of fat cells, which give the skin buoyancy, volume and shape. This extra padding also helps cushion muscles, bones and organs in the event of an injury.


What’s even cooler? Fat in the hypodermis acts as a natural insulator to help so you don’t get too cold.

useful information

Thank you for: Emergency power reserves and insulation

How it ages:

  • The volume of facial fat decreases, resulting in a loss of fullness
  • Redistribution of facial fat can cause sagging to appear
See also  3 skin "brightening" ingredients that damage and age the skin and body

How to maintain it: The choices you make every day and your environment affect your overall health, including the functions of your skin. Taking care of your sleep schedule, diet and other lifestyle factors can go a long way towards deep skin health.

Dermis: the middle layer

Think of this as the chunky knit sweater made from layers of skin. This supporting tissue contributes to this skin textureelasticity and firmness.

A healthy dermis is actually ten times thicker than the epidermis it sits under. Interwoven with blood vessels, connective tissue and nerve endings, you can thank this layer for your sensitivity to temperature and touch.

In addition, the dermis houses the so-called extracellular matrix. This matrix contains three important components: collagen fibers, elastin fibers and proteoglycans. Thick collagen fibers provide resistance while thin elastin fibers provide elasticity. And moisture heroes Proteoglycans can store up to 1000 times their molecular weight in water. Hello hydration!

But there are a few things that you might not be so grateful to the dermis for. First, acne. Pesky pimples can start in the hair follicles and oil glands that are housed in this layer of skin. Sebaceous glands or sweat glands can also be found here – so you can also thank the dermis for your after-effects of the spinning class.

useful information

Thank you for: The elasticity, resilience and fullness of your skin

How it ages:

  • Elastin and collagen fibers are broken down, reducing the thickness, firmness and elasticity of the skin
  • Proteoglycans decrease and dry out the skin

How to maintain it: Stock up on deeply hydrating serums. Also look for products with a combination of proteoglycans and pre-proteoglycans to support skin firmness and elasticity.

Flavo-C Ultraglican Serum |  ISDINFlavo-C Ultraglican Serum in Ampoule

Epidermis: the top layer

What’s the last layer you rely on when you’re bundling up for inclement weather? If you’re thinking of a thin, yet strong, weather-resistant case, then your skin is on the same page.

Serve as primary Protective barrier against environmental influenceslike toxins, bacteria and harsh weather conditions, this outer layer is only about the thickness of a sheet of paper.

The epidermis is made up mostly of cells called keratinocytes, which contain a fibrous protein that looks familiar: keratin. These cells act like building blocks, gluing together with a mortar-like mixture of fatty acids and water to form the outermost layer of the epidermis: the skin barrier. This barrier is like a wall that provides your skin with much-needed protection.

See also  La Roche-Posay Cicaplast Baume B5 vs. Eucerin Aquaphor Review

Keratinocytes are constantly on the move, ascending from the lower epidermis to the skin barrier. As they mature, they reach the surface of the skin and their bond with the fatty acid mortar becomes weaker. The result? Natural skin turnover and peeling.

Finally, don’t forget Thank the epidermis for your skin’s unique color, pigment patterns and photoprotective abilities. Why? It is responsible for melanogenesis: the way the skin responds to UV radiation (mainly UVA rays and blue sunlight) by producing melanin.

useful information

Thank you for: Protection from environmental stressors

How it ages:

  • Cell renewal slows down, resulting in a rough skin texture
  • Free radicals and other toxins begin to build up, increasing the appearance of fine lines and wrinkles
  • Melanin distribution becomes irregular, resulting in uneven pigmentation

How to maintain it: Exfoliating helps shed dead skin cells and promotes healthy turnover — meaning it can also help lighten and even out your skin texture. For extra TLC, add a restorative antioxidant serum to fight the effects of free radicals.

Melatonic Serum |  ISDINMelatonic Antioxidant Serum

The last shift

Understanding the basics of your skin structure can help you make wiser skincare decisions. And there’s one important daily skincare decision that every layer of skin will thank you for: sunscreen! Pro tip: remember to apply it daily and throughout the day according to the label directions.

Discover our line with high sun protection factor, Broad Spectrum Sunscreen.


Paul AJ Kolarsick, BS, Maria Ann Kolarsick, MSN, ARNP-C, and Carolyn Goodwin, APRN-BC, FNP. (nd). 1 SS Skin Cancer Chapter 1 – ons | Retrieved February 8, 2022 from Videira IF, Moura DF, Magina S. Mechanisms regulating melanogenesis . A bras dermatol. 2013;88(1):76-83. doi:10.1590/s0365-05962013000100009 Skin: layers, structure and function. Cleveland Clinic. (nd). Retrieved February 8, 2022 from

No votes yet.

Please wait…


Leave a Reply

Your email address will not be published.