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Most of the skin on our bodies "toughens" up with use. A callus will form which thickens the skin and will remain that way with continued use. Not all areas on the body respond this way, however. Areas of the body that are less padded by muscle and/or fat are prone to pressure sores.
Pressure sores (also known as bed sores, pressure ulcers, or decubitis ulcers) are a breakdown and ulceration of tissue due to a combination of the weight of the body on the surface of the skin and the friction of a resistant surface such as a bed or chair. Persons that are non-mobile are vulnerable to the formation of pressure sores when left lying or sitting for long periods of time in the same position.
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