The skin is our largest organ. If the skin of a typical 150-pound (68-kilogram) adult male were stretched out flat, it would cover about 2 square yards (1.7 square meters) and weigh about 9 pounds (4 kilograms). Our skin protects the network of muscles, bones, nerves, blood vessels, and everything else inside our bodies. Our eyelids have the thinnest skin, the soles of our feet the thickest.

Hair is actually a modified type of skin. Hair grows everywhere on the human body except the palms of the hands, soles of the feet, eyelids, and lips. Hair grows more quickly in summer than winter, and more slowly at night than during the day.

Like hair, nails are a type of modified skin — and they're not just for beauty. Nails protect the sensitive tips of our fingers and toes. Human nails are not necessary for living, but they do provide support for the tips of the fingers and toes, protect them from injury, and aid in picking up small objects. Without them, we'd have a hard time scratching an itch or untying a knot. Nails can be an indicator of a person's general health, and illness often affects their growth.

Skin Basics

Skin is essential to a person's survival. It forms a barrier that prevents harmful substances and microorganisms from entering the body. It protects body tissues against injury. Our skin also controls the loss of life-sustaining fluids like blood and water, helps us regulate body temperature through perspiration, and protects us from the sun's damaging ultraviolet rays. Without the nerve cells in our skin, we couldn't feel warmth, cold, or other sensations. Our skin can also respond to situations and emotions: Muscles in the skin called erector pili contract to make the hairs on our skin stand up straight when we are cold or frightened — for 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 (pronounced: ep-ih-dur-mis), dermis, and the subcutaneous (pronounced: sub-kyoo-tay-nee-us) tissue.

Skin Cells and Layers

The upper layer of our skin, the epidermis, is the tough, protective outer layer. It is 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 (pronounced: meh-lah-nuh-sites) produce melanin, the pigment that gives skin its color. All people have roughly the same number of melanocytes; those of dark-skinned people produce more melanin. Exposure to sunlight increases the production of melanin, which is why people get suntanned or freckled.
• Keratinocytes (pronounced: ker-uh-tih-no-sites) produce keratin, a type of protein that is a basic component of hair and nails. Keratin is also found in skin cells in the skin's outer layer, where it helps create a protective barrier.
• Langerhans (pronounced: lahng-ur-hanz) 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.

Without certain molecules in the dermis, our skin wouldn't stretch when we bend or reposition itself when we straighten up. These two types of fibers in the dermis, collagen and elastin, help the skin stretch and reposition itself when we move. 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 (most wrinkles are caused by sun exposure, though!).

The dermis also contains a person's sebaceous glands. These glands, which surround and empty into our hair follicles and pores, produce an oil called sebum (pronounced: see-bum) 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. This can lead to acne when pores become clogged by too much sebum and too many dead skin cells. Later in life, these glands produce less sebum, which contributes to dry skin in older people.

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-producing glands. The eccrine (pronounced: eh-krun) glands are found everywhere in our bodies, although they are 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 other type of sweat-producing gland, 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.

Hair Basics

The hair on our heads isn't just there for looks. It keeps us warm by preserving heat. The hair in our nose, ears, and around our eyes protects these sensitive areas of the body from dust and other small particles. Eyebrows and eyelashes protect our eyes by decreasing the amount of light and particles that go into them. The fine hair that covers our bodies provides warmth and protects our skin. Hair also cushions the body against injury.

Human hair consists of the hair shaft, which projects from the skin's surface, and the root, a soft thickened bulb at the base of the hair embedded in the skin. The root ends in the hair bulb. The hair bulb sits in a sac-like pit in the skin called the follicle, from which the hair grows.

At the bottom of the follicle is the papilla, where hair growth actually takes place. The papilla contains an artery that nourishes the root of the hair. As cells multiply and produce keratin to harden the structure, they are pushed up the follicle and through the skin's surface as a shaft of hair. Each hair has three layers: the medulla at the center, which is soft; the cortex, which surrounds the medulla and is the main part of the hair; and the cuticle, the hard outer layer that protects the shaft.

Hair grows by forming new cells at the base of the root. These cells multiply to form a rod of tissue in the skin. The rods of cells move upward through the skin as new cells form beneath them. As they move up, they are cut off from their supply of nourishment and start to form a hard protein called keratin in a process called keratinization (pronounced: ker-uh-tuh-nuh-zay-shun). As this process occurs, the hair cells die. The dead cells and keratin form the shaft of the hair.

Each hair grows about 1/4 inch (about 6 millimeters) every month and keeps on growing for up to 6 years. The hair then falls out and another grows in its place. The length of a person's hair depends on the length of the growing phase of the follicle. Follicles are active for 2 to 6 years; they rest for about 3 months after that. A person becomes bald if the scalp follicles become inactive and no longer produce new hair. Thick hair grows out of large follicles; narrow follicles produce thin hair.

The color of a person's hair is determined by the amount and distribution of melanin in the cortex of each hair (the same melanin that's found in the epidermis). Hair also contains a yellow-red pigment; people who have blonde or red hair have only a small amount of melanin in their hair. Hair becomes gray when people age because pigment no longer forms.

All About Nails

Nails grow out of deep folds in the skin of the fingers and toes. As epidermal cells below the nail root move up to the surface of the skin, they increase in number, and those closest to the nail root become flattened and pressed tightly together. Each cell is transformed into a thin plate; these plates are piled in layers to form the nail. As with hair, nails are formed by keratinization. When the nail cells accumulate, the nail is pushed forward.

The skin below the nail is called the matrix. The larger part of the nail, the nail plate, looks pink because of the network of tiny blood vessels in the underlying dermis. The whitish crescent-shaped area at the base of the nail is called the lunula.

Fingernails grow about three or four times as quickly as toenails. Like hair, nails grow more rapidly in summer than in winter. If a nail is torn off, it will regrow if the matrix is not severely injured. White spots on the nail are sometimes due to temporary changes in growth rate.

Skin Problems

Some of the things that can affect the skin, nails, and hair are described below.

Dermatitis

Medical experts use the term dermatitis (pronounced: dur-mah-ty-tus) to refer to any inflammation that might be associated with swelling, itching, and redness of the skin. There are many types of dermatitis, including:

• Atopic dermatitis is also called 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 or food, seasonal, or environmental allergies.
• Contact dermatitis occurs when the skin comes into contact with an irritating substance or a substance that a person is allergic to. The best-known cause of contact dermatitis is poison ivy. But lots of other things cause contact dermatitis, including chemicals found in laundry detergent, cosmetics, and perfumes, and metals like jewelry, nickel plating on a belt buckle, or the back of the buttons on your jeans.
• Seborrheic dermatitis, an oily rash on the scalp, face, chest, and back, is related to an overproduction of sebum from the sebaceous glands. This condition is common in teens.

Bacterial Skin Infections

• Impetigo. Impetigo (pronounced: im-puh-ty-go) is a bacterial infection that results in a honey-colored, crusty rash, often on the face near the mouth and nose.
• Cellulitis. Cellulitis (pronounced: sell-yuh-ly-tus) 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 cellulitic area is usually warm and 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.

Fungal Infections

Fungal Infections of the Skin and Nails

• 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.
• Tinea infection (ringworm). Ringworm, which isn't a worm at all, is a fungus infection that can affect the skin, nails, or scalp. Tinea (pronounced: tih-nee-uh) fungi 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.
• Tinea pedis (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.

Other Skin Problems

• 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 — meaning they can be easily caught from other people.
• Viral infections. Many viruses cause characteristic rashes on the skin, including varicella (pronounced: var-ih-seh-luh), the virus that causes chicken pox and shingles; herpes simplex, which causes cold sores; human papillomavirus (HPV), the virus that causes warts; and a host of others.
• Acne (acne vulgaris). Acne is the single most common skin condition 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 protection habits established during these years can help prevent skin cancers like melanoma (pronounced: meh-luh-no-ma, 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.

In addition to 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.

Disorders of the Scalp and Hair

• Tinea capitis, a type of ringworm, is a fungal infection that forms a scaly, ring-like lesion in the scalp. It's contagious and common among school-age children.
• Alopecia (pronounced: ah-luh-pee-sha) is an area of hair loss. Ringworm is a common cause of temporary alopecia in children. Alopecia can also be caused by tight braiding that pulls on the hair roots (this condition is called traction alopecia). Alopecia areata (where a person's hair falls out in round or oval patches on the scalp) is a less common condition that can sometimes affect teens.

Reviewed by: Patrice Hyde, MD
Date reviewed: October 2009

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