**Question:** False regarding acanthosis nigricans is

A. Acanthosis nigricans is a benign skin lesion.
B. Acanthosis nigricans is a condition caused by genetic factors.
C. Acanthosis nigricans is a rare condition.
D. Acanthosis nigricans is exclusively seen in children.

**Correct Answer:**

**Core Concept:** Acanthosis nigricans is a clinical entity characterized by hyperpigmentation and hyperkeratosis of the skin, often associated with hormonal or underlying systemic disorders.

**Why the Correct Answer is Right:**
Acanthosis nigricans is not a benign skin lesion, but a clinical sign of underlying systemic disorders, such as insulin resistance, obesity, or hormonal imbalances. It is not exclusively seen in children but can occur in adults as well. The condition is caused by hormonal factors, specifically insulin resistance or hormonal imbalances, rather than genetic factors.

**Why Each Wrong Option is Incorrect:**

A. False: Acanthosis nigricans is not a benign skin lesion, but a clinical sign indicating an underlying systemic disorder.
B. False: Acanthosis nigricans has a diverse range of underlying causes, not limited to genetic factors.
C. False: Acanthosis nigricans is not a rare condition; it is relatively common in clinical practice.
D. False: Acanthosis nigricans can occur in both children and adults, not exclusively in children.

**Clinical Pearl:**
Acanthosis nigricans is a clinical clue pointing towards underlying hormonal imbalances or systemic disorders, such as obesity, insulin resistance, or malignancies. A thorough clinical examination and further investigations are required to determine the specific cause.