**Fordyce Disease**
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**Core Concept**
Fordyce disease, also known as Fordyce granules or Fordyce spots, is a benign condition characterized by the presence of ectopic sebaceous glands on the mucosal surfaces of the oral cavity, lip, and genitalia.

**Why the Correct Answer is Right**
Fordyce disease occurs due to the abnormal migration of sebaceous gland cells during embryonic development. These ectopic sebaceous glands can be found on the mucosal surfaces, including the lips, cheeks, and genitalia. The condition is often asymptomatic but can be cosmetically distressing.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to Fordyce disease.
* **Option B:** Fordyce disease is not related to the adrenal glands.
* **Option C:** This option is not a known association with Fordyce disease.

**Clinical Pearl / High-Yield Fact**
Fordyce disease is a benign condition, but it can be a diagnostic clue for other underlying conditions, such as ectodermal dysplasias or other genetic syndromes.

**Correct Answer:** D.