Which finding is most characteristic of scarlet fever?

• A. slapped cheek
• B. strawberry tongue
• C. Koplik's spots
• D. honey-crusted lesions

Answer: (B)

Scarlet fever features include a toxin-mediated rash and a distinctive strawberry tongue. The erythrogenic toxin from group A Streptococcus causes a diffuse, sandpaper-like rash and mucosal inflammation, and the tongue often becomes bright red with enlarged, bumpy papillae—giving the “strawberry tongue” appearance. This mucosal change is classic for scarlet fever, helping differentiate it from other exanthems: the slapped-cheek rash points to parvovirus B19, Koplik spots to measles, and honey-crusted lesions to impetigo. So the strawberry tongue is the best answer because it is the hallmark mucosal manifestation of scarlet fever.