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Introduction to Hypersensitivity and Inflammatory Skin Disorders

By

Julia Benedetti

, MD, Harvard Medical School

Last full review/revision Jul 2020| Content last modified Jul 2020
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Pressure Injury
Pressure ulcers (PUs) are defined as areas of necrosis and ulceration where tissues are compressed between bone and hard surfaces, such as a bed or chair. There are many risk factors for PUs, which include age > 65 years, decreased mobility, and impaired sensation, among others. Of the main factors that influence the development of PUs, which of the following contributes to PUs but is not a direct cause?  
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