**Question:** Hidradenitis suppurativa is found to occur in which body region?

**Core Concept:** Hidradenitis suppurativa is a chronic inflammatory disorder affecting the apocrine gland-bearing skin regions. Apocrine glands are found in axillae (armpits), inguinal (groin), and perianal areas.

**Why the Correct Answer is Right:** Hidradenitis suppurativa primarily affects these regions because apocrine glands secrete sticky, proteinaceous sweat, which traps bacteria and hair follicles leading to inflammation and infection.

**Why Each Wrong Option is Incorrect:**

A. **Option A (Anogenital region):** While hidradenitis suppurativa can involve the anogenital area, the correct answer is restricted to axillae and inguinal regions as they primarily harbor apocrine glands.

B. **Option B (Face):** Hidradenitis suppurativa predominantly affects axillae and inguinal regions, not the face, which lacks apocrine glands.

C. **Option C (Neck):** Although hidradenitis suppurativa can involve the neck, the correct answer is limited to axillae and inguinal regions due to the presence of apocrine glands.

D. **Option D (Limb):** While hidradenitis suppurativa can affect limbs, the primary focus is on axillae and inguinal regions, which harbour apocrine glands.

**Clinical Pearl:** The correct answer is primarily driven by the presence of apocrine glands in specific anatomic locations, which predisposes them to the development of hidradenitis suppurativa.

**Correct Answer:** C. Axillary and inguinal regions

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In summary, hidradenitis suppurativa primarily occurs in axillary and inguinal regions because these areas house apocrine glands, which are responsible for the pathogenesis of this disorder. While other regions can be involved, the primary focus is on axillae and inguinal regions due to the presence of apocrine glands.