**Core Concept:**
Hyperpigmentation refers to an increased production of melanin in the skin, resulting in darkening of the skin. There are various types of hyperpigmentation, including solar lentigo, melasma, and post-inflammatory hyperpigmentation. The correct answer highlights a specific type of hyperpigmentation that is not associated with the mentioned condition.

**Why the Correct Answer is Right:**
The correct answer, **Option D**, states that hyperpigmentation is not seen in "Post-inflammatory hyperpigmentation". Post-inflammatory hyperpigmentation occurs due to inflammation, such as from trauma, infection, or certain medications, leading to increased melanin production. It is a type of hyperpigmentation that is a consequence of an underlying inflammatory process and is not the primary condition being discussed.

**Why Each Wrong Option is Incorrect:**

**Option A:** Solar lentigo (age spots) is a benign, pigmented lesion caused by prolonged sun exposure. Solar lentigo is a form of hyperpigmentation and is thus incorrect.

**Option B:** Melasma is a common, chronic, acquired, symmetrical hyperpigmentation of the face. Melasma is a type of hyperpigmentation and is not the correct answer.

**Option C:** Post-inflammatory hyperpigmentation, as explained above, is a type of hyperpigmentation that occurs due to inflammation and is not the primary condition being discussed.

**Clinical Pearl:**
Post-inflammatory hyperpigmentation is often confused with melasma, but they are different entities. Melasma is caused by hormonal factors, while post-inflammatory hyperpigmentation results from inflammation. Understanding the difference between these conditions is crucial for accurate diagnosis and treatment planning.

**Correct Answer:** D. Post-inflammatory hyperpigmentation is not associated with hyperpigmentation.