Pressure ulcers mainly affect people who have long periods of rest due to their old age, illness or paralysis. This situation favors the development of ulcerous lesions in the parts of the body that press against a surface.
A pressure ulcer may appear when the area of the skin is subjected to a pressure for a long time and there is no displacement to relieve the position of the body. All parts of the body that are not protected by muscles or fatty tissue against the pressure produced by the position may develop decumbent ulcers: Sacral region, the heels, the minor trochanter of the femur and the ankles. If preventive measures are not taken in patients at high risk of pressure ulcer, the affected areas redden and evolve to lesions with blisters. As a result, the tissue becomes necrotic. A pressure ulcer can deepen until reaching the periosteum.