There are many reasons for small red dots on the face, the following are common in clinical practice: 1. In the summer, outdoor activities, due to strong ultraviolet radiation, resulting in small red dots on the face, solar dermatitis, as well as after replacing new cosmetics, after eating certain foods to consider this situation is allergic dermatitis. 2. Small red dots of pinpoint size on the face, mainly itching, these small red dots can be connected into pieces. The symptoms of oozing and erosion after scratching are considered facial eczema, which is formed due to skin allergies caused by the indiscriminate use of cosmetics, medications, food, etc. 3. Heat rash, which is caused by heavy sweating in hot summer weather, leads to poor sweat excretion, causing pinhead-sized small red dots to appear on the face with a tip. There is also acne, which is common in adolescence and can also be manifested as small red dots on the face. These are the common causes of this disease. After these conditions appear, go to the local outpatient clinic or hospital dermatology department and seek treatment according to medical advice after diagnosis to achieve early detection and early treatment and prevent the development of the disease from delaying treatment.