If there is a urinary tract infection such as frequent, urgent or painful urination, there is a small amount of blood in the leukorrhea. This is due to a small amount of bleeding from the urethra or urinary system caused by the urinary tract infection, which erodes into the vulva and presents the condition of blood in the leukorrhea. Of course, it is also possible to have inflammation of the vulva and vagina and present a few blood stains in the leukorrhea, which needs to be reviewed and combined with the woman’s menstrual history, contraceptive history and other discomforts, such as increased leukorrhea and odor, it may be inflammation of the vulva and vagina, and retrograde infection may also spread to the urinary tract infection, so anti-inflammatory treatment is needed.