Swollen, hyperemic fungiform papillae is seen in:
Early in the course of scarlet fever, the tongue exhibits a white coating, and the fungiform papillae are edematous and hyperemic, projecting above the surface as small red knobs. This phenomenon has been described clinically as ‘strawberry tongue’. The coating of the tongue is soon lost; beginning at the tip and lateral margins, and this organ becomes deep red, glistening and smooth except for the swollen, hyperemic papillae. The tongue in this phase has been termed as the ‘raspberry tongue’.
Ref: Shafer's textbook of oral pathology 7th edition page 318
Riboflavin deficiency
Scarlet fever
Familial dysautonomia
Median rhomboid glossitis