Application: Decubitus ulcers are caused by Multiple Choice O An infestation of the skin with mites that itch; the scratching causes ulcers. O 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. O A tumor that starts in the lower layers of the skin and opens up to the surface causing a decubitus ulcer. O An allergenic agent that irritates the skin and the decubitus ulcer is formed. O A caustic chemical such as an acid that gets on the skin and causes the ulcer