The fourth degree of cleanliness is not cancerous, it just means that there is a bacterial infection in the vagina, and the bacterial infection is relatively serious, the cleanliness is the worst, and it reaches the fourth degree, it is recommended to do active treatment, for example, you can use Jie Er Yin to rinse the vagina, and then insert compound metronidazole pessary, or bisacodyl pessary, 1 course of treatment, a total of 7 days of time for the treatment. During the period of medication, you should not have sex, do not eat acidic and spicy food, and it is better to iron the underwear in boiling water and then expose them to the sun. In addition, after the treatment, stop the medicine for 3-7 days to go to the hospital to review the routine examination of the leukorrhea. It is recommended to do cervical cancer screening once a year.