Keloid is differentiating with hypertrophic scar
**Core Concept**
Keloid and hypertrophic scars are both raised scars, but they have distinct differences in their **pathophysiology** and **clinical presentation**. Keloids are characterized by an overactive **healing process**, while hypertrophic scars are limited to the **boundaries of the original wound**.
**Why the Correct Answer is Right**
The correct answer is based on the understanding that keloids extend beyond the **original wound margins**, whereas hypertrophic scars remain within the **boundaries of the original injury**. This is due to the excessive **collagen synthesis** and **fibroblast activity** in keloids.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because keloids are not simply a variant of hypertrophic scars.
**Option B:** Incorrect as it doesn't accurately describe the key difference between keloid and hypertrophic scars.
**Option C:** Incorrect because it doesn't specify how keloids differ from hypertrophic scars in terms of **wound boundary**.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that keloids can occur anywhere on the body, but they are more common on **ears**, **chest**, and **shoulders**.
**Correct Answer:** D. Keloid extends beyond the original wound margins.