**Core Concept**
A dysplastic nevus, also known as an atypical mole, is a type of melanocytic lesion that is considered to be a marker for an increased risk of developing malignant melanoma. These lesions are typically larger and more irregular in shape than benign acquired nevi, and are often characterized by a combination of features that are suggestive of dysplasia.

**Why the Correct Answer is Right**
The correct answer is a characteristic that is commonly seen in dysplastic nevi and is not typically seen in benign acquired nevi. Dysplastic nevi often have an irregular border, and may have a variation in color, including shades of brown, pink, or white. They may also be larger in size, often greater than 6 mm in diameter. The presence of an irregular, notched, or scalloped border is a key feature that distinguishes dysplastic nevi from benign acquired nevi.

**Why Each Wrong Option is Incorrect**
**Option A:** Color variation is not a specific characteristic that distinguishes dysplastic nevi from benign acquired nevi, as both types of lesions can exhibit color variation.
**Option B:** Size alone is not a reliable indicator of a dysplastic nevus, as both benign and malignant lesions can be large.
**Option C:** Asymmetry is a feature that is more commonly associated with malignant melanoma, rather than dysplastic nevi.

**Clinical Pearl / High-Yield Fact**
The ABCDE rule is a useful mnemonic for distinguishing malignant melanoma from benign lesions: Asymmetry, Border irregularity, Color variation, Diameter greater than 6 mm, and Evolving shape or size. However, it is worth noting that dysplastic nevi often exhibit some of these features, but to a lesser degree than malignant melanoma.

**Correct Answer:** C.