When the leukorrhea looks like green pus and snot, the patient is considered to have vaginitis, in which the most probable is trichomonas vaginitis, because the typical characteristics of trichomonas vaginitis discharge are thin, purulent, foamy, and possibly yellowish-white purulent when the discharge contains a large number of leukocytes, or yellowish-green discharge if there are other infections in the combination. The reason for the foamy, foul odor is due to the anaerobic fermentation of carbohydrates by Trichomonas, which produces putrid gases. Through the general state of vaginal discharge, you can determine what vaginitis you probably have, but the simple characteristics of the leukorrhea can not be a direct diagnosis, but also to carry out leukorrhea laboratory tests, to clarify the nature of vaginitis and then carry out symptomatic treatment.