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Skin is a soft external tissue that covers the entire body of vertebrates. In humans, the skin” is considered the body’s largest organ; its area is about 2 square meters. The Skin keeps our internal organs from the surrounding environment by using a multi-layered system including different cell layers, cell barriers, and protective oils.
The Skin is more than a protective barrier between the body and its surroundings. This large organ also has a vital role in maintaining the health of the body; among these roles, we can mention the regulation of body temperature through sweating and hot flushes when it is hot and highlighting the place where hair grows when it is cold. Therefore, we find that sweating is actually an important function of the skin to defend the health of the body. You can find more complete information in the article “What Causes Excessive Underarm Sweating?“.
In addition, the Skin can produce vitamin D from sunlight, which is vital for bone health.
The type of Skin can vary greatly between species and even between individuals.
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Human Skin is a covering tissue on the body’s surface that protects it from the external environment and also receives sensory motivation from the external environment. The Skin contains three layers of tissue:
This is the external layer of the Skin, which forms the primary protective structure and is also called the stratum corneum.
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It is a fibrous layer that supports and strengthens the epidermis.
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It is the deepest layer of the Skin in the body, which consists of a subcutaneous layer of fat under the dermis and provides nutrients for the other two layers of the Skin and the body in relation to the outside environment. It acts as an insulator.
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As mentioned above, in mammals, there are two main skin layers: the epidermis, which is in direct contact with the body’s environment, and the dermis, which is the layer located beneath the epidermis. These two layers are vital for many of the Skin’s functions. In this section, we will examine these skin layers in more detail.
The epidermis is a layer of Skin that prevents pathogens from entering the body and water from leaving the body.
This layer is composed of flat cells called squamous cells. Cobblestone means mosaic-like and describes the smooth, multi-parted shape of these cells.
The cells of the epidermis layer include different types, which include:
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Most burns and skin injuries include injuries that occur in the epidermis. Such injuries can heal quickly. Deeper injuries that also damage the dermis layer may be very serious and dangerous.
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The basement membrane is a thin layer of fibers between the dermis and the epidermis. This membrane can control any compound that is exchanged between the two layers of the dermis and the epidermis and is considered a double defense layer against pathogens and a protector against the loss of water and other vital substances through the Skin.
When the Skin needs to grow or heal, the basement membrane can relax its control over the passage of compounds between the two layers and allow water and nutrients to repair the damaged epidermis. Hence, this part helps accelerate the healing process of the epidermis. It has an effective role.
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The dermis or Skin is a layer of the skin structure located in deeper parts than the epidermis and is placed as a shield around the body that protects it from severe and harsh environmental effects.
This layer contains many complex structures, including blood vessels, nerves, hair follicles, sweat glands, and sebaceous glands. These fat glands, also known as “sebaceous glands,” create a waxy and oily substance that covers the entire Skin to protect it from environmental damage.
The dermis consists of fibers that include collagen and glycosaminoglycan compounds and are able to hold a large amount of water in this layer, thus preventing the swelling and bruising of the Skin to some extent.
A network of elastic fibers like collagen keeps the Skin tight and repairs it after stretching and damage. This can be one of the benefits of collagen for skin and hair.
The dermis cells are nourished by blood vessels, while none of the blood vessels penetrate the epidermis, and the epidermis receives material only by diffusion from its underlying layer. The dermis also has nerves and sensory organs at different levels.
Skin has various functions in the body that can be useful for organisms. Among the important functions of the Skin in the body, the following can be mentioned:
This function of the Skin is its most important function; as the first defense barrier of the body, the Skin prevents the entry of pathogenic agents such as viruses and bacteria into the body tissues so that these pathogenic agents can only enter the Skin in the event of damage to the Skin and wounds created in it or from They can enter the body through cavities such as the nose and mouth.
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Amphibians, with their very thin Skin, must always be near water to prevent their Skin from drying out. Humans and most other land animals have thick skins that decrease very little water. When humans live in desert conditions, their Skin becomes thicker to prevent the body from losing water through sweating in the dry air.
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The Skin has nerves that transmit information about pressure, the type of foreign substances, heat, cold, pain, and pleasure to the brain. This feature allows the organism to respond appropriately to its surroundings.
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The Skin of humans and some other mammals can lose water regularly through the process of sweating. By releasing water on the Skin, the body can cool itself through evaporation. Since the hottest water molecules evaporate first, as a result, with this evaporation, heat is also removed from the body, and its temperature decreases.
The body can also regulate heatstroke by “flushing”; this process allows the body to flow blood with a high temperature from the internal parts of the body to the Skin, thereby reducing the blood temperature and generally regulating the body temperature. to be
In addition to the above mechanisms, it is thought that the phenomenon of “spiking hair” is a response to regulate body temperature.
When this phenomenon happens in the body, the small muscles in the place where the hair grows in the Skin are tightened in such a way that it causes the body hair to stand up. In this case, by increasing the amount of air trapped on the surface of the Skin by skin hair, the body temperature decreases less, and the body stays warm.
Some scientists believe that this phenomenon occurs in response to fear or other strong emotions in the body, which may be similar to the same phenomenon in animals to scare predators.
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Many animals have Skin that is made of specific colors and patterns that blend in with their surroundings and cause visual errors.
This skin feature is very important for both predator and prey species. If the hunters cannot easily see and identify their prey in the environment, they cannot have a successful hunt.
On the other hand, if predators can camouflage themselves well in the environment using their skin features, they cannot be detected by prey species.
The Skin of many animals produces a static color pattern, such as the brown body color of goats and deer, which imitates this color from the grass and dead leaves of the environment, and the same mechanism in the Skin of the “vine snake” that includes bright green patches or the color of infected flowers. “Fish table” is seen.
However, a few species have Skin that uses more advanced camouflage mechanisms. Sunflowers and octopuses are among these species whose Skins have cells that can release various amounts of pigment at will.
This mechanism essentially allows their Skin to act like a television screen, so these creatures can change their skin color to match any background color in their environment.
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Many animals store fat and water in their skin tissues. This storage allows the organism to cover these materials as insulation around the body and be used when the body needs them.
Many animals that live in cold climates have this ability in a more advanced state and have created thick layers of fat bubbles under the Skin that act as a good insulator between the low temperature of the outside environment and the internal organs of the animal’s body.
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The fluid that the Skin secretes from the body, such as sweat, can also have another purpose; for example, this fluid can be considered a signal to other animals and used in communication functions. Many animals mark their territory with a chemical compound that has a specific scent from glands in their Skin.
These markers can even include information about an animal’s age, sex, health, and availability for mating.
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While the Skin of all humans has basically the same structure, minor biological differences can greatly affect the proper Skin Cycling Routine Morning And Night and maintenance of the body’s Skin. People can have more or less active oil glands or more or less active sweat glands, and also different people may have different abilities to store water in their Skin.
People who have oily Skin may have problem of large and open pores in their Skin, and often, the Skin of these people’s faces is shiny, and many pimples may be seen on their face skin.
This skin appearance is because the sebaceous glands in their dermis layer produce a lot of oil, which can create many pores in the Skin. These pores cause pimples and problems in the appearance of these people’s Skin.
Combination or mixed Skin is the type that is oily in some areas but may be dry in other areas. In people with combination skin, the nose, chin, and forehead are the most common oily areas of the face. Other areas, such as species, may be dry.
People with combination skin have large pores, blackheads, and shiny Skin because of the production of large amounts of oil by the glands in the dermis. This amount of fat can accumulate in the skin pores and cause blackheads and skin spots.
Warning: “Popping Blackheads” can cause many problems for your skin, which are explained in detail in the relevant article.
Normal or natural Skin is Skin with an average level of oil and water, which protects the Skin from environmental factors but does not give the Skin a skinny or greasy appearance. This type of Skin has small pores and few blemishes because the oil-producing glands in this type of Skin are too active.
Peskin with dry Skin has a harsh and dull face and often has more wrinkles and lines than other skin types, especially on the face. In dry Skin, Skin are often red spots caused by sensitivity, and there are almost no pores for fat accumulation.
As a result, the Skin can quickly lose its moisture; in this case, the Skin becomes very irritable and gets damaged quickly. This can be one of the reasons for the question: Why Is My Skin Wrinkling At A Young Age?. To read about more reasons, you can refer to the article.
People who live in dry areas like deserts are more likely to show symptoms of dry Skin and skin loss of more moisture than people who live in humid areas.
To recognize your skin type, see the article “How Can I Know What My Skin Type Is?” You will find detailed and practical information.
As the first cell layer of the body that is in contact with the outside environment, the Skin suffers from many injuries and diseases. Some of these problems, disorders, and skin diseases are mentioned below:
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Related: “What Is The Root Cause Of Dyshidrotic Eczema?“
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According to experts, the reason for this disease is a disorder in the body’s immune system, which causes the Skin to weaken faster than normal.
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Related: “How To Wash Seborrheic Dermatitis Scalp?“.
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Corns have a hard core that may cause inflammation and even pain in the surrounding area. Calluses are usually larger than corns, have different shapes, and are not painful. Corns usually occur on the soles, heels, ankles, knees, and even hands.
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There are also common skin diseases that are classified as sexually transmitted diseases, that is, skin infections that can be transmitted through sex. The most important of these diseases are:
Currently, there is no definitive cure for this illness, but with the use of some drugs, the symptoms can be alleviated, and the risk of transmission can be reduced. Since this virus is easily transmitted through unprotected sexual contact and even oral sex, it is very important to use a condom during sex.
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The cause of this disease is some strains of human papillomavirus. This disease does not cause clinical symptoms in many people, but some strains are the main reason for cervical cancer and vaginal cancer in women.
These warts can be flat or raised, little or large, pink or skin-colored. Due to the easy transmission and high prevalence of this virus and its dangerous side effects, it is important to be sure to inject the vaccine, the Gardasil vaccine, and periodically perform the HPV test and Pap smear test in women.
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But if it is not diagnosed and progresses slowly, it can cause many complications for the person, complications such as neurological problems and even death. This virus is highly contagious and is usually transmitted through sexual intercourse.
The symptoms of this illness are various depending on the stage of the disease. This virus can cause open sores called chancres or wart-like sores and various pimples.
There are many types of skin disorders and diseases, and in this article, we tried to examine the most common and important ones. These diseases make up a significant part of the world’s diseases, and almost 25% of the world’s people suffer from some kind of skin disease.
There are some skin symptoms that are common to many skin diseases, and it is better to see a dermatologist if you see and continue to develop them.
The way to prevent skin diseases depends on the cause. Obviously, you cannot prevent the development of skin diseases of genetic origin or autoimmune diseases, but many skin diseases can be prevented and treated by following health and medical tips.
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Dr. Majid Zohrabi started treating his patients in Dubai in 2022 and continues his activities in private medical centers in the UAE.