Menstrual leave generally refers to menstruation. A small amount of bleeding after two days of clean menstruation may be due to endocrine disorders, endometrial inflammation, gynecological diseases, internal diseases and so on. 1. Endocrine disorders: The endometrium is fully repaired, which may cause vaginal bleeding due to insufficient estrogen secretion. 2. Inflammation of the uterine lining: in patients with endometrial inflammation, the tissues are more fragile, causing irregular shedding of the lining, leading to vaginal bleeding. 3. Gynecological diseases: patients suffering from endometriosis, submucosal fibroids and other diseases can cause irregular vaginal bleeding. 4. Internal medicine diseases: patients with internal medicine diseases such as coagulation disorders and thrombocytopenia, which lead to blood abnormalities, can cause irregular vaginal bleeding. Patients who have a small amount of bleeding after two days of clean menstruation should go to the hospital in time, under the guidance of the doctor in order to clarify the cause of the disease, and give targeted treatment.