A man with a systemic disease shows ‘Gottron’s sign’ on his face and upper trunk. Which of the following pathological condition shows positive ‘Gottron’s sign’?
**Core Concept**
The question is testing knowledge of dermatomyositis, a type of inflammatory muscle disease characterized by skin rash and muscle weakness. **Dermatomyositis** is an autoimmune condition that affects the skin and muscles.
**Why the Correct Answer is Right**
**Dermatomyositis** is the correct answer because it is a condition known for **Gottron's sign**, which are erythematous papules on the knuckles, elbows, and knees, but can also appear on the face and upper trunk. This sign is a hallmark of dermatomyositis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not relate to the description of Gottron's sign.
**Option B:** This is also incorrect as it does not match the clinical presentation of Gottron's sign.
**Option C:** This option is incorrect because it is unrelated to the specific skin manifestations of Gottron's sign.
**Option D:** This is incorrect as it is not associated with Gottron's sign.
**Clinical Pearl / High-Yield Fact**
Remember, **Gottron's sign** is a pathognomonic sign of dermatomyositis, helping differentiate it from other inflammatory myopathies.
**Correct Answer:** D. Dermatomyositis.