A pressure ulcer, commonly called a bedsore, is an injury to the skin and any underlying tissues. It results from excessive pressure over time and is found on the heels, sacrum, ankles, hips and vertebrae. A pressure ulcer most commonly occurs over any bony prominence, especially when there is a lack of circulation. Even though it can happen to anyone, it most commonly occurs in individuals who have impaired mobility and consciousness, have thinner skin, are unable to respond to pain, and/or are incontinent (Jarvis, 2016).

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The epidermis, is the first thin outer layer of the skin (Jarvis, 2016).
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The dermis, the second layer, is mostly made up of collagen or connective tissue. This protein allows the dermis to be supportive. All nerves, blood vessels and lymphatics lie here (Jarvis, 2016).
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The subcutaneous tissue is located under the dermis. This is made up of adipose tissue which stores fat for energy and provides temperature control (Jarvis, 2016).