This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Keloid scar is 
Select and explain. 
A. Excessive scar tissue that does not extend beyond the boundary of the original incision or wound., B. Excessive scar tissue that extends beyond the boundaries of the original incision or wound, C. Pale, flat and stretched in appearance, often appearing on the back and in areas of tension., D. Pale, flat and stretched in appearance, often appearing on the chest and sternum and in areas of no tension.
B: Excessive scar tissue that extends beyond the boundaries of the original incision or wound
Answer: B: Excessive scar tissue that extends beyond the boundaries of the original incision or wound 
Explanation: An atrophic scar is a pale, flat and stretched in appearance, often appearing on the back and in areas of tension. A hyperophic scar is defined as excessive scar tissue that does not extend beyond the boundary of the original incision or wound. A keloid scar is defined as excessive scar tissue that extends beyond the boundaries of the original incision or wound Bailey and Love 27e pg: 30