A Black patient who is immobile presents with a decubitus ulcer. Which of the following is incorrect about pressure ulcer staging?

The stage of an ulcer cannot be determined until enough slough or eschar is removed to expose the base of the wound.

Ulcers do not progress through stages in formation or healing.

In a person with dark skin pigmentation, a stage I ulcer may appear as a persistent red, blue, or purple discoloration.

The presence of a pressure ulcer does not indicate that the patient does not have access to adequate services or support.