<p>Pressure ulcers from medical devices are a growing concern for patients, clinicians and healthcare providers alike. While the typical presentation of a pressure ulcer is near or over a bony prominence, a device-related pressure ulcer occurs near or under the medical device. Any medical device can cause a pressure ulcer, e.g. an unconscious person with a cochlear implant who remains lying on that side without repositioning. This report highlights the case of a man who developed a pressure ulcer due to an  ill-fitting oxygen mask. </p>