Pathology · single question
What is the pathognomonic oral manifestation of measles (rubeola)?
Show answer and explanation
Correct answer: B. Koplik spots
- A. Nikolsky sign is seen in pemphigus vulgaris and toxic epidermal necrolysis — not measles.
- B. Koplik spots are pathognomonic for measles. They appear as small white/bluish-white spots on a red base on the buccal mucosa (opposite lower molars), emerging 1–2 days BEFORE the skin rash.
- C. White pseudomembrane is characteristic of pseudomembranous candidiasis or diphtheria.
- D. Vesicular eruption on the palate occurs in herpangina (Coxsackievirus), not measles.