Final answer:
c) Keloid. The nurse should document the 2.5 cm of darkened tissue over the 3 mm. injury as a keloid, which is a raised hypertrophic scar due to the overproduction of scar tissue.
Step-by-step explanation:
The correct documentation of the client's condition with an accumulation of 2.5 cm of darkened tissue scar over the area of a 3 mm injury would be a keloid. This is because a keloid represents a type of hypertrophic scar which forms when there is an overproduction of scar tissue, with collagen formation continuing even after the wound has been healed. Unlike atrophic scars that have a sunken appearance and result from conditions such as acne and chickenpox, keloids are raised above the level of the surrounding skin and can be much larger than the original wound.
During the tissue repair phase, collagen is replaced by fibroblasts, and granulation tissue forms as new blood vessels grow within the healing area. When the amount of granulation tissue is excessive, and the capillaries begin to disappear, it may result in the formation of a keloid, which is a pale, often sizable, visible scar.
If a nurse encountered such a wound, it would be reported as a keloid to accurately describe the overgrowth of scar tissue that has occurred, which is more prominent and extensive than the original injury.