Final answer:
The excess of scar tissue on the leg of the African American client would be documented as a keloid.
Step-by-step explanation:
The excess of scar tissue on the leg of the African American client would be documented as a keloid. Keloids are raised, hypertrophic scars that result from the overproduction of scar tissue. They form when the process of collagen formation continues after the wound is healed. Keloids are more common in individuals with darker skin tones, like African Americans.