The most diagnostic feature of scarlet fever is:

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The most diagnostic feature of scarlet fever is the characteristic skin rash, which appears as a fine, red rash that feels like sandpaper and spreads over the entire body, sparing the face but often involving the torso, arms and legs, accompanied by fever and other symptoms. A white or red coating of the dorsal tongue, known as "strawberry tongue," is also a common symptom of scarlet fever, but it is not specific to this disease and can be seen in other viral and bacterial infections. Extreme fever and malaise are also common symptoms of scarlet fever, but they are not unique to this disease and can be seen in other types of infections as well.

The Most Diagnostic Feature of Scarlet Fever Is