The possible reasons for the red spots in the oral cavity are as follows: 1, due to long-term consumption of spicy, irritating food, or like to eat especially hot and hard food, such food will cause direct stimulation of the oral mucosa, causing red spots on the mucosa, and even cause the mucosa to break. 2, caused by viral infection in the mouth, commonly caused by infection with herpes simplex virus caused by herpetic stomatitis, the disease will not only cause the appearance of red spots in the mouth. The disease will not only cause red dots in the mouth, but also make the mouth blisters. 3, suffering from bacterial stomatitis or mouth because of caries, wisdom teeth pericoronitis, periodontitis and other diseases are not timely treatment, so that the number of pathogenic factors in the mouth caused by bacterial infection, will also cause oral red dots. 4, suffering from fungal stomatitis patients, the mouth will appear red dots, mostly due to infection caused by Candida albicans.