Assessing a bedridden Client’s sacrum

The nurse is assessing a bedridden client when a large erythematic area is noted on the client’s sacrum.  In addition, the center of the injury looks like an abrasion with a shallow center.  The nurse would classify this ulcer as:

 

How will the nurse treat this type of pressure ulcer?

What risk factors could have contributed to this patient developing a pressure ulcer?