A 24 year male came to OPD with brownish itchy patches in axilla, blood lamp examination shows “coral red” fluroscence. Most likely diagnosis is:
**Core Concept**
The question tests knowledge of dermatological conditions, specifically those causing brownish itchy patches in the axilla. The "coral red" fluorescence under Wood's lamp examination is a key diagnostic clue, pointing towards a fungal infection.
**Why the Correct Answer is Right**
The "coral red" fluorescence is characteristic of **Malassezia furfur**, a lipophilic yeast that causes **Pityriasis versicolor**. This condition presents with discolored, scaly patches, often in the axilla or other sebaceous areas. The coral red fluorescence is due to the presence of **porphyrins** produced by the fungus.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not correlate with the specific diagnostic finding of coral red fluorescence.
**Option B:** Incorrect as it is not typically associated with this specific fluorescence pattern.
**Option C:** Incorrect because, although it can cause skin lesions, it does not exhibit coral red fluorescence under Wood's lamp.
**Clinical Pearl / High-Yield Fact**
Pityriasis versicolor is a common condition that can be diagnosed clinically, but the Wood's lamp examination is a useful tool to confirm the diagnosis, especially when the clinical presentation is atypical.
**Correct Answer:** D. Pityriasis Versicolor.