A 6-year-old female presents with a 4-day history of fever, sore throat, and a diffuse erythematous 'sandpaper-like' rash that blanches on pressure and accentuates in skin folds (Pastia's lines), accompanied by circumoral pallor. What is the diagnosis?

Answer and explanation

Correct answer: D. Scarlet fever

  1. Step 1: Scarlet fever is caused by an erythrogenic exotoxin produced by Streptococcus pyogenes (Group A beta-hemolytic Streptococcus).
  2. Step 2: Key features include pharyngitis, strawberry tongue, circumoral pallor, and a finely papular 'sandpaper' erythematous exanthem with petechial accentuation in flexural creases (Pastia's lines).
  3. Step 3: Treatment of choice is oral penicillin or amoxicillin.
Answer
Scarlet fever.
Why not the others: 'Measles' presents with cough, coryza, conjunctivitis, Koplik spots, and a maculopapular rash spreading from hairline downward; 'Roseola' features high fever that resolves abruptly before the onset of a pink macular rash; 'Rubella' causes mild rash with prominent postauricular and suboccipital lymphadenopathy.

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