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Skin is the largest organ in the human body covering an average area of about 1.8 metres and making up around a sixth of your body weight. Skin covers the whole body, but varies in thickness, with the parts of the body which receive the most wear and tear having the thickest skin, i.e. the soles of the feet.
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The skin is often known as "the largest organ in the human body". This applies to exterior surface, as it covers the body, appearing to have the largest surface area of all the organs. Moreover, it applies to weight, as it weighs more than any single internal organ, accounting for about 15 percent of body weight. For the average adult human, the skin has a surface area of between 1.5-
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The skin on a person's face is seen by people that person interacts with. For some people, therefore, facial skin care is of particular importance, and they often use cosmetics to deal with the appearance of the face and condition of the skin, such as those for pore control and black head cleansing.
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Skin continually renews itself. Old skin cells are gradually shed and replaced by new ones, with most cells being replaced every 28 days.
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Like most of the body, skin contains a high percentage of water. If it dries out this can cause skin disorders. Since it is exposed to the sun and wind, skin is at more risk of drying out than any other parts of the body. Therefore the water content of skin needs to be maintained in order to ensure skin health.
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An average-
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The skin has three major layers -
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The next layer of the skin is the dermis. This layer contains a number of important substances such as collagen and reticulin, which prevent the skin from tearing; elastin, which makes the skin resilient; and jellylike substances that make the skin soft and compressible.
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The third layer, subcutaneous tissue, is primarily made up of fat, which provides insulation, shock absorption, and calorie reserves. Both the dermis and the subcutaneous tissue contain sensory and motor nerves.
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Among the most common causes of skin disorders are infections, overexposure to sunlight, follicle dysfunction, and hormonal imbalance. Parasites, external substances, cell dysfunction, genetic factors, stress, and aging also cause skin problems.
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The American Academy of Dermatology reports that one out of four people seeking medical advice about new skin problems is bedridden.
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Teenagers and young adults account for a significant number of dermatology (skin) patients. In highly urban areas, however, a surprisingly large proportion of patients are adults.
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Acne is the leading skin disease, occurring in 20 percent of all patients seeking treatment for skin disorders. Contact skin disorders, such as poison ivy and burns or rashes caused by industrial or household chemicals, are the second most common problem.
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Other common skin disorders include skin cancer, warts, fungal infections, and psoriasis.
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More than three million workdays are lost each year because of skin diseases.
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Chronic skin disease accounts for up to 50 percent of workers compensation claims in some states.
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Skin disease is the fourth largest cause of disability in the Armed Forces, affecting almost seven percent of military personnel.
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