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Skin is essential in many ways. It forms a barrier that prevents harmful substances and microorganisms from entering the body. It protects body tissues against injury. It also controls the loss of life-sustaining fluids like blood and water, helps regulate body temperature through perspiration (sweating), and protects from the sun’s damaging ultraviolet rays.
Without the nerve cells in skin, people couldn’t feel warmth, cold, or other sensations. For instance, goosebumps form when the erector pili muscles contract to make hairs on the skin stand up straight when someone is cold, excited, or frightened — the blood vessels keep the body from losing heat by narrowing as much as possible and keeping the warm blood away from the skin’s surface, offering insulation and protection.
Every square inch of skin contains thousands of cells and hundreds of sweat glands, oil glands, nerve endings, and blood vessels. Skin is made up of three layers: the epidermis, dermis, and the subcutaneous tissue.
Things That Can Affect Skin
The term dermatitis refers to any inflammation (swelling, itching, and redness) possibly associated with the skin. There are many types of dermatitis, including:
- Atopic dermatitis (eczema). It’s a common, hereditary dermatitis that causes an itchy rash primarily on the face, trunk, arms, and legs. It commonly develops in infancy, but can also appear in early childhood. It may be associated with allergic diseases such as asthma and seasonal, environmental, and food allergies.
- Contact dermatitis. This occurs when the skin comes into contact with an irritating substance or one that the person is allergic or sensitive to. The best-known cause of contact dermatitis is poison ivy, but there are many others, including chemicals found in laundry detergent, cosmetics, and perfumes, and metals like nickel plating on jewelry, belt buckles, and the back of a snap.
- Seborrheic dermatitis. This oily rash, which appears on the scalp, face, chest, and back, is related to an overproduction of sebum from the sebaceous glands. This condition is common in infants and adolescents.
- Impetigo. Impetigo is a bacterial infection that results in a honey-colored, crusty rash, often on the face near the mouth and nose.
- Cellulitis. Cellulitis is an infection of the skin and subcutaneous tissue that typically occurs when bacteria are introduced through a puncture, bite, or other break in the skin. The area with cellulitis is usually warm, tender, and has some redness.
- Streptococcal and staphylococcal infections. These two kinds of bacteria are the main causes of cellulitis and impetigo. Certain types of these bacteria are also responsible for distinctive rashes on the skin, including the rashes associated with scarlet fever and toxic shock syndrome
- Candidal dermatitis. A warm, moist environment, such as that found in the folds of the skin in the diaper area of infants, is perfect for growth of the yeast Candida. Yeast infections of the skin in older children, teens, and adults are less common.
- Ringworm. Ringworm, which isn’t a worm at all, is a fungus infection that can affect the skin, nails, or scalp. Fungi called dermatophytes can infect the skin and related tissues of the body. The medical name for ringworm of the scalp is tinea capitis; ringworm of the body is called tinea corporis; and ringworm of the nails is called tinea unguium. With tinea corporis, the fungi can cause scaly, ring-like lesions anywhere on the body.
- Athlete’s foot. This infection of the feet is caused by the same types of fungi that cause ringworm. Athlete’s foot is commonly found in adolescents and is more likely to occur during warm weather.
- Parasitic infestations. Parasites (usually tiny insects or worms) can feed on or burrow into the skin, often resulting in an itchy rash. Scabies and lice are examples of parasitic infestations. Both are contagious and can be easily caught from other people.
- Viral infections. Many viruses cause characteristic rashes on the skin, including varicella, the virus that causes chickenpox and shingles; herpes simplex, which causes cold sores; human papillomavirus, the virus that causes warts; and a host of others.
- Acne (acne vulgaris). Acne is most common in teens. Some degree of acne is seen in 85% of adolescents, and nearly all teens have the occasional pimple, blackhead, or whitehead.
- Skin cancer. Skin cancer is rare in children and teens, but good sun protectionhabits established during these years can help prevent skin cancers such as melanoma (a serious form of skin cancer that can spread to other parts of the body) later in life, especially among fair-skinned people who sunburn easily.
Besides these diseases and conditions, the skin can be injured in a number of ways. Minor scrapes, cuts, and bruises heal quickly on their own, but other injuries — severe cuts and burns, for example — require medical treatment.
The upper layer of our skin, the epidermis, is the tough, protective outer layer. It’s about as thick as a sheet of paper over most parts of the body. The epidermis has four layers of cells that are constantly flaking off and being renewed. In these four layers are three special types of cells:
- Melanocytes produce melanin, the pigment that gives skin its color. All people have roughly the same number of melanocytes; the more melanin that is produced, the darker the skin. Exposure to sunlight increases the production of melanin, which is why people get suntanned or freckled.
- Keratinocytes produce keratin, a type of protein that is a basic component of hair, skin, nails, and helps create an intact barrier.
- Langerhans cells help protect the body against infection.
Because the cells in the epidermis are completely replaced about every 28 days, cuts and scrapes heal quickly.
Below the epidermis is the next layer of our skin, the dermis, which is made up of blood vessels, nerve endings, and connective tissue. The dermis nourishes the epidermis. Two types of fibers in the dermis — collagen and elastin — help the skin stretch when we bend and reposition itself when we straighten up. Collagen is strong and hard to stretch, and elastin, as its name suggests, is elastic. In older people, some of the elastin-containing fibers degenerate, which is one reason why the skin looks wrinkled.
The dermis also contains a person’s sebaceous glands. These glands, which surround and empty into hair follicles and pores, produce the oil sebum that lubricates the skin and hair. Sebaceous glands are found mostly in the skin on the face, upper back, shoulders, and chest.
Most of the time, the sebaceous glands make the right amount of sebum. As a person’s body begins to mature and develop during the teenage years, though, hormones stimulate the sebaceous glands to make more sebum. When pores become clogged by too much sebum and too many dead skin cells, this contributes to acne. Later in life, these glands produce less sebum, which contributes to dry skin as people age.
The bottom layer of our skin, the subcutaneous tissue, is made up of connective tissue, sweat glands, blood vessels, and cells that store fat. This layer helps protect the body from blows and other injuries and helps it hold in body heat.
There are two types of sweat glands:
- The eccrine glands are found everywhere, although they’re mostly in the forehead, palms, and soles of the feet. By producing sweat, these glands help regulate body temperature, and waste products are excreted through them.
- The apocrine glands develop at puberty and are concentrated in the armpits and pubic region. The sweat from the apocrine glands is thicker than that produced by the eccrine glands. Although this sweat doesn’t smell, when it mixes with bacteria on the skin’s surface, it can cause body odor. A normal, healthy adult secretes about 1 pint (about half a liter) of sweat daily, but this may be increased by physical activity, fever, or a hot environment.