Small red dots on the tongue may be caused by oral ulcers, papillitis of the tongue and scarlet fever. 1. Mouth ulcers: Mouth ulcers can cause different degrees of ulceration on the oral mucosa, and some patients with mouth ulcers may also have small red dots on the tongue. 2. papillitis of the tongue: papillitis of the tongue refers to the patient’s papilla of the tongue because of irritation and pain and discomfort, at this time the patient’s papilla of the tongue will be congested and other symptoms appear, from the surface of the tongue there will be small red dots on the tongue. 3. Scarlet fever: patients with scarlet fever may have the symptom of diffuse bright red rash all over the body, and at this time, patients may also have small red dots on the tongue. When you find small red dots on the tongue, you need to consult a doctor in time to keep your mouth clean and hygienic to avoid secondary infections.