Darriers sign seen in –
**Core Concept**
Darrier's sign is a clinical sign associated with the diagnosis of hidradenitis suppurativa, a chronic skin condition characterized by recurrent, painful abscesses and nodules in apocrine gland-bearing areas. It is a physical examination finding that indicates the presence of apocrine sweat gland dysfunction.
**Why the Correct Answer is Right**
Darrier's sign is a dimpling of the skin that occurs when an individual pinches the affected skin area. This dimpling is due to the contraction of the apocrine sweat glands, which are embedded in the dermis. When the skin is pinched, the apocrine glands contract, causing the skin to dimple. This is a specific sign that helps differentiate hidradenitis suppurativa from other skin conditions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Darrier's sign is not a characteristic of acne vulgaris, which is a different skin condition that affects the pilosebaceous units.
**Option B:** This option is incorrect because Darrier's sign is not a feature of folliculitis, which is an inflammation of the hair follicles.
**Option C:** This option is incorrect because Darrier's sign is not a sign of eczema, which is a group of conditions that cause inflammation of the skin.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Darrier's sign is a specific clinical finding that can aid in the diagnosis of hidradenitis suppurativa. When assessing patients with skin lesions, it's crucial to perform a thorough physical examination, including pinching the affected skin area to check for Darrier's sign.
**Correct Answer: D. Hidradenitis Suppurativa.**