## Core Concept
Keloids are a type of raised, thick scarring that can occur after skin injury. They are characterized by an overgrowth of scar tissue that extends beyond the original wound site. Keloids are more common in certain populations and can be itchy, painful, or tender to the touch.

## Why the Correct Answer is Right
To determine the correct answer, we need to assess each option given about keloids. However, since the specific details of options A, B, C, and D are not provided, we'll proceed with a general understanding of keloids. Typically, keloids are known for their raised appearance, potential to be itchy or painful, and tendency to grow beyond the site of the original injury. They do not usually regress spontaneously and can be treated with various methods including topical treatments, injections, or surgical removal.

## Why Each Wrong Option is Incorrect
Without specific details on each option, we can still discuss general misconceptions about keloids:
- **Option A:** If a statement claims keloids are flat, this would be incorrect because keloids are characterized by their raised appearance.
- **Option B:** If a statement suggests keloids only occur in certain ethnic groups, while it's true they are more common in some populations, saying "only" could be misleading or incorrect.
- **Option C:** If a statement implies keloids are not painful, this could be incorrect as keloids can be itchy, painful, or tender.
- **Option D:** If a statement says keloids always regress over time, this would be incorrect as keloids typically do not regress spontaneously.

## Clinical Pearl / High-Yield Fact
A key point to remember is that keloids tend to have a higher recurrence rate after treatment compared to other types of scars. A classic clinical correlation is that keloids often occur on the ears, chest, back, and shoulders, and individuals with a history of keloid formation are at increased risk for developing additional keloids.

## Correct Answer: D.
Given the general nature of this explanation and without specific statements for A, B, C, and D, the focus remains on understanding keloid characteristics. Typically, a statement that keloids always regress over time (if that were an option) would be incorrect, aligning with **Correct Answer: D.** assuming D stated a fact that does not align with known characteristics of keloids, such as spontaneous regression.