Okay, let's tackle this question about keloids. First, I need to recall what I know about keloids. They're a type of scar, right? But not just any scar—more severe. They form due to abnormal collagen deposition after skin injury. The question is asking which statement is true about them.

So the core concept here is wound healing and the pathophysiology of keloids. The key is understanding the difference between keloids and other types of scars, like hypertrophic scars. Keloids extend beyond the original wound, whereas hypertrophic scars stay within the wound area. Also, keloids are more common in certain populations, like those of African descent.

The correct answer would need to highlight a true statement about their formation. Let's think about possible options. Maybe one of the options talks about their tendency to regress over time. Wait, I remember that keloids don't usually regress; they might even grow. Another point is that they're more common in younger individuals. Also, treatment options like corticosteroid injections are used, but recurrence is common.

Now, the incorrect options might confuse keloids with hypertrophic scars. For example, an option stating that they regress spontaneously would be incorrect because keloids don't do that. Another wrong option might say they're caused by bacterial infection, which is not the case. The pathogenesis is more about genetic predisposition and fibroblast hyperactivity rather than infection.

Clinical pearl: Remember that keloids are a result of excessive collagen synthesis and can be challenging to treat. They're more prevalent in certain ethnic groups and often occur in areas like the chest, shoulders, and ears. Treatments include intralesional corticosteroids, laser therapy, and pressure therapy, but prevention is key—avoiding unnecessary trauma in high-risk individuals.

Putting this all together, the correct answer should state that keloids are more common in individuals of African descent and tend to be larger than the original wound. The other options would be incorrect based on the characteristics we just discussed.

**Core Concept**
Keloids result from excessive collagen deposition during wound healing, characterized by overgrowth beyond the original injury. They are distinct from hypertrophic scars, which remain confined to the injury site. Genetic predisposition and fibroblast hyperactivity play central roles in their formation.

**Why the Correct Answer is Right**
Keloids are more common in individuals of African, Asian, or Hispanic descent due to genetic factors influencing collagen metabolism. They persist indefinitely and often worsen over time, requiring interventions like corticosteroid injections or laser therapy. Their pathogenesis involves dysregulated TGF-β signaling and increased fibroblast activity, leading to abnormal extracellular matrix accumulation.

**Why Each Wrong Option is Incorrect**
**Option A:** *Keloids regress spontaneously* – False; keloids do not regress and often enlarge.
**Option B:** *Common in elderly individuals* – False; they are more prevalent in adolescents and young adults.
**Option C:** *Caused by bacterial infection* – False; they arise from wound healing abnormalities, not infection.

**Clinical Pearl / High-Yield Fact**
Remember: Keloids are not just thick scars—they are *progressive*, *painless*, and *non-remitting*. Avoid surgical excision alone due to high recurrence risk; combine with corticosteroids or radiotherapy for better outcomes.

**Correct Answer: B. More

✓ Correct Answer: B. It appears a few days after surgery