An Overview of Skin
Your skin is the largest organ on your body, made up of several
different components, including water, protein, lipids and different
minerals and chemicals. If you're average, your skin weighs about six
pounds. It's job is crucial: to protect you from infections and germs.
Throughout your life, your skin will change constantly, for better or
worse. In fact, your skin will regenerate itself approximately every 27
days. Proper skin care is essential to maintaining the health and
vitality of this protective organ.
How Can I Keep My Skin Healthy?
It's easy to forget to drink that glass of water or to cleanse
yourself at night when you're tired. But over time, those bad habits can
take a toll on your skin. Each day, provide your skin with:
- Plenty of water.
- Thorough cleansing. You
should perform this twice daily. At night, make sure you remove all your
make-up and cleanse properly before going to bed.
- Balanced nutrition.
- Toning. After you cleanse
with your bar soap or other cleanser, make sure you use a formulated toner or
astringent to remove fine traces of oil, dirt and make-up that you may have
missed when cleansing.
- Moisturizing. This is necessary even for those who have
oily skin. There are plenty of moisturizers on the market that are
Over the course of your life, you should pay attention to
all parts of your skin. Familiarize yourself with it, so you'll notice any
changes that might occur, such as different moles or patches that might indicate
skin cancer. Whenever you have a question or concern, make sure you see
How Does My Skin Work?
Medical terms for various parts of your skin are commonly used today
to sell skin care products and procedures. Here's a rough guide to what
those terms mean.
Epidermis: The Outer Layer of Skin
The epidermis is the thinnest layer in your skin, but it's
responsible for protecting you from the harsh environment. The epidermis
has five layers of its own: stratum germinativum, stratum spinosum,
stratum granulosum, stratum lucidum, and stratum corneum. The epidermis
also hosts different types of cells: keratinocytes, melanocytes and
Langerhans cells. Keratinocytes produce the protein known as keratin,
the main component of the epidermis. Melanocytes produce your skin
pigment, known as melanin. Langerhans cells prevent foreign substances
from getting into your skin.
Dermis: The Middle Layer
This is the layer responsible for wrinkles. The dermis is a complex
combination of blood vessels, hair follicles, and sebaceous (oil)
glands. Here, you'll find collagen and elastin, two proteins necessary
for skin health because they offer support and elasticity. Fibroblasts
are the cells you'll find in this layer, because they synthesize
collagen and elastin. This layer also contains pain and touch receptors.
Hypodermis: The Fatty Layer
Reduction of tissue in this layer is what causes your skin to sag.
This layer is also known as the subcutis. It hosts sweat glands, and fat
and collagen cells. The hypodermis is responsible for conserving your
body's heat and protecting your vital inner organs.
Collagen is the most abundant protein in the skin, making up 75% of
your skin. This is also your fountain of youth, for it's responsible for
warding off wrinkles and fine lines. Over time, environmental factors
and aging diminish your body's ability to produce collagen.
When you hear the word elastin, think elastic. This protein is found
with collagen in the dermis, and is responsible for giving structure to
your skin and organs. As with collagen, elastin is affected by time and
the elements. Diminished levels of this protein cause your skin to
wrinkle and sag.
Keratin is the strongest protein in your skin. It's also dominant in
hair and nails. Keratin is what forms the rigidity of your skin.
Reviewed by the doctors at The Cleveland Clinic,
Department of Dermatology.
Last Editorial Review: 1/31/2005 6:16:27 AM
Edited by Michael W. Smith, MD, April 2003, WebMD.
Portions of this page ©The Cleveland Clinic 2000-2003.