A 27 year old male has itchy, excoriated papules on forehead and exposed pas of arms and legs for 3 years. The disease was most severe in rainy season and improved completely in winters. Most likely diagnosis is:
**Core Concept**
The question is testing the student's ability to diagnose a dermatological condition based on its characteristic clinical presentation, seasonal variation, and distribution of lesions. This condition is a type of chronic skin disorder that is often triggered by environmental factors.
**Why the Correct Answer is Right**
The patient's symptoms of itchy, excoriated papules on exposed areas, particularly on the forehead and arms, are classic for a condition that is exacerbated by humidity and improves in dry weather. The seasonal variation, with the condition being more severe in rainy seasons and improving in winters, is also a key diagnostic clue. This condition is caused by an allergic reaction to the bites of certain mites, which are more active in humid environments.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not match the clinical presentation and seasonal variation described in the question. The condition described in this option does not typically improve in dry weather.
* **Option B:** This option is incorrect because it does not account for the itchy, excoriated papules and the specific distribution of lesions on exposed areas.
* **Option C:** This option is incorrect because it does not match the seasonal variation and environmental triggers described in the question.
**Clinical Pearl / High-Yield Fact**
Chronic skin conditions that worsen in humid environments and improve in dry weather often have an allergic or parasitic etiology.
**Correct Answer:** C.