Not to be used for advertising or in a defamatory context Bumps on the tongue of a 4 year old boy with scarlet fever. Known as 'strawberry tongue', this is one of the symptoms of the disease. Scarlet fever is caused by infection with group A Streptococcus bacteria. The signs and symptoms include a sore throat, fever, headaches, swollen lymph nodes, and a characteristic deep red rash.age.