Red dots on the skin may be caused by local trauma, or eczema, cherry angioma, etc., as follows: 1. local trauma: if the patient’s skin is subjected to local trauma, resulting in subcutaneous capillary rupture, there will be symptoms of red dots on the skin, generally do not need special treatment, can be eliminated by themselves. 2. Eczema: Eczema is related to immunity, allergy, psychosocial, external environment and other factors. In the acute stage, there will be erythema, papules, papules and so on, often accompanied by itching, and the patients will have the symptom of red dots on the skin. 3. Cherry angioma: due to the skin capillary proliferation, expansion, resulting in capillary papular dilatation, tortuous, clinical mainly manifested as multiple round red papules, patients will feel red dots on the skin. The causes of red dots on the skin are many, only three reasons are cited above for reference, and it is recommended that patients seek medical treatment to confirm the cause of the disease and then carry out targeted treatment.