A skin scraping treated with KOH reveals 'spaghetti and meatballs' appearance (short hyphae and yeast clusters). This is diagnostic for:
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Correct answer: Pityriasis versicolor
Pityriasis versicolor is caused by Malassezia furfur. The classic 'spaghetti and meatballs' description refers to the combination of short, thick hyphae and round yeast-like cells.
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