The reasons for small amount of brown bleeding during non-menstrual period are as follows: 1. It is because of gynecological inflammation, such as common gynecological inflammatory diseases like vaginitis, pelvic inflammatory disease and endometritis, because most gynecological inflammatory diseases are caused by bacterial infections, such as common bacteria like Staphylococcus aureus, Streptococcus pneumoniae and Salmonella, when these bacterial infections cause the skin mucosal tracts of the infected area to When these bacterial infections increase the permeability of the mucosal tracts of the infected area, resulting in the exudation of inflammatory substances, and at the same time increase the permeability of the walls of capillaries and small arteries, resulting in extravasation of blood, all these combined factors can lead to a small amount of brown vaginal bleeding during non-menstrual period. 2. This may cause a small amount of bleeding and brownish color during menstruation.