Final answer:
The first sign of a pressure ulcer is a vesicle or blister on the skin.
Step-by-step explanation:
The first sign of a pressure ulcer is a vesicle or blister on the skin. This occurs when there is damage to the skin and underlying tissues due to prolonged pressure or friction. The vesicle or blister may be filled with clear fluid or blood, and it can be painful or tender to touch.
Other possible signs of a pressure ulcer include a dark brown bruise on the skin, an open sore on the skin, or red or blue-gray discoloration on the skin. These signs may indicate a more severe stage of pressure ulcer formation.
Learn more about pressure ulcers