Decubitus Ulcers Are Caused by

Decubitus ulcers are caused by

A) An infestation of the skin with mites that itch; the scratching causes ulcers.
B) Pressure on a bony projection for a prolonged period of time cuts off the blood supply to an area of skin and an ulcer forms.
C) A tumor that starts in the lower layers of the skin and opens up to the surface causing a decubitus ulcer.
D) An allergenic agent that irritates the skin and the decubitus ulcer is formed.
E) A caustic chemical such as an acid that gets on the skin and causes the ulcer.