What should you do if you get pressure sores from a mask?

Mask sores. You can get sores from medical devices as you have found out. There are many skin protectants and cushions available on the market to try to prevent this type of injury. A visit with a wound center and or wound and ostomy nurse may be a worthwhile pursuit. If the device has a well known manufacturer, then contacting the company is also worthwhile to see what they recommend, including a different d.
Foam dressing. Apply a hydrocolloid dressing or silicone soft foam dressing between the mask and face to prevent pressure damage. Apply aquaphor or vaseline to the pressure sore. If it looks infected apply topical antibiotic ointment or see your doctor for an oral antibiotic.