What Is the Cause of Decubitus Ulcers

Multiple Choice

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.