Causes of red dots on the lips include hemangioma, salpingitis, lipitis, eczema and so on. 1. Hemangioma: due to a variety of factors lead to the proliferation of blood vessels during embryonic development, the proliferation of blood vessel expansion leads to the phenomenon of red dots can appear on the lips. 2. Dengue: because of type B hemolytic streptococcus invades the lymphatic vessels of the skin, resulting in inflammation of the lips, these inflammatory factors will damage the skin, thus leading to the occurrence of red rashes. 3. Lipitis: due to a variety of factors lead to inflammation of the lips, this will also appear in the lips of the red rash. 4. Eczema: because of a variety of factors lead to inflammation of the dermis and epidermis, these inflammatory factors damage the skin, so it triggers subcutaneous hemorrhage, at this time there will also be red spots. The phenomenon of red spots on the lips, please go to the hospital in time to check the cause of the disease in the doctor’s guidance, symptomatic treatment.