A baby with a red dot on the tip of the tongue that looks like a prune is said to have a prune tongue. Scarlet fever can have a prune tongue. Scarlet fever is a respiratory infection caused by infection with streptolytic bacteria. The common symptom is fever with sore throat. After 24 hours of fever, a peripheral rash may appear, which is flushed and fades with finger pressure, and a prune tongue and pale circles around the lips may appear. The main treatment is the application of antibiotics, and the effective antibiotics are the penicillin family of antibiotics.