Final answer:
A pressure ulcer is caused by immobility and prolonged pressure on the body. It can occur when a person is bedridden or uses a wheelchair without changing positions frequently.
Step-by-step explanation:
A pressure ulcer, also known as a bedsore, is caused by immobility. When a person remains in the same position for a prolonged period of time, it can result in pressure being applied to certain areas of the body, leading to tissue damage and the development of an ulcer. This can occur when a person is bedridden or uses a wheelchair without changing positions frequently.
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