What is the cause of decubitus ulcers?
A) The skin is infected with mites that itch, and the scratching causes ulcers.
B) Pressure on bony projections for a prolonged period of time cuts off the blood supply to an area of skin, and an ulcer forms.
C) A tumor arises in the lower layers of the skin and opens up to the surface.
D) An allergenic agent irritates the skin.
E) A caustic chemical such as an acid gets on the skin.The word decubitus means lying down.
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