In adult patients with darkly pigmented skin (in the acute care setting), what is the most effective wound assessment to assess pressure ulcer?

The topic is “In adult patients with darkly pigmented skin (in the acute care setting), what is the most effective wound assessment to assess pressure ulcer?” I need the background to consist of “what the problem with pressure injury, how much money is it costing, how does it impact the patient, patient’s quality of life, how long has this problem existed, what has been done about this problem previously, length of stay in the hospital, how much is it costing the patient, pressure ulcer/injury related to different ethnic groups?