Red dots on the skin have many causes, commonly caused by allergies, but also may be vascular nevus, angioma and other disease performance, can be broadly divided into the following categories: 1, allergies: allergic people inhale pollen or eat a certain food, contact with animal fur, certain cosmetics, etc., due to allergen stimulation led to the emergence of eczema or dermatitis, in addition to the body will be small red dots, but also accompanied by varying degrees of itching, tingling, etc., if the above symptoms appear, the first need to find allergens, if the symptoms are relatively mild, out of the allergen can be gradually relieved, but also oral anti-allergy drugs can also be quickly relieved. If the symptoms are mild, they can be gradually relieved after the allergens are removed, and oral anti-allergy drugs can also be taken for quick relief, but if the symptoms are heavy, timely medical treatment is needed; 2. The main manifestations are vasodilation, cell proliferation, and small red spots on the skin, which can affect the appearance of patients. If it is combined with abdominal pain, arthralgia and kidney damage, it needs active symptomatic treatment; 4. Cherry hemangioma: also known as senile hemangioma, it is the most common hemangioma, which can be manifested as small cherry-colored red dots, which can occur in all parts of the body, but mainly in the trunk, and increases with age, and can be removed by laser treatment.