This can be a little tricky.
There are six categories of pressure ulcers: stages 1, 2, 3, 4, unable to stage and deep tissue injury. There are a pressure injuries that do not necessarily need to be covered. For example, a stage 1 ulcer does not have a break in the skin and can be left uncovered in many cases. Some ulcers are left uncovered because of location but have protective creams applied.