Bedsore is an example of which of the following type of ulcer?

Bedsore and perforating ulcers are typical examples of trophic ulcers. Trophic ulcers have punched-out edge with slough in the floor resembling a gummatous ulcer. Factors predisposing its development are: injury, anemia, moisture, pressure and malnutrition. Ref: Bailey and Love's Sho Practice of Surgery, 24th Edition, Page 939; A Manual of Clinical Surgery, 6th Edition, Page 51; Schwaz's Principles of Surgery, 9th Edition, Chapter 9.