A young girl presents with a pink, sandpaper-like rash on the chest, a swollen white-coated tongue described as 'strawberry tongue', and flushed cheeks with a high fever. Which diagnosis is most likely?

• A. Kawasaki disease
• B. Measles
• C. Eczema
• D. Scarlet fever

Answer: (D)

Recognizing scarlet fever comes from the combination of a rough, sandpaper-like red rash and the strawberry tongue in a child with fever. The rash is diffuse and feels rough on the chest and trunk, and it often becomes more pronounced in skin folds (Pastia lines) as it spreads. The tongue becomes “strawberry” because the tongue’s papillae swell and then shed, giving a white coating early on with red projections later. These are classic mucocutaneous signs produced by pyrogenic exotoxins from group A Streptococcus during or after a throat infection.

Measles would more typically present with cough, coryza, conjunctivitis, Koplik spots, and a rash that starts at the hairline and spreads downward. Eczema is a chronic, itchy skin condition without this sudden high fever or strawberry tongue. Kawasaki disease can include strawberry tongue, but it also features prolonged fever with other signs like swollen hands/feet, cervical lymphadenopathy, and conjunctival injection, which aren’t described here. So the combination described most strongly points to scarlet fever.

Treatment involves antibiotics (usually penicillin) to eradicate the infection and prevent rheumatic fever; the rash and symptoms improve with effective therapy.