A small amount of Lactobacillus means that there is a small amount of Lactobacillus in the vagina. Lactobacillus plays an important role in maintaining the vaginal microbial balance and a small amount of Lactobacillus mainly indicates an imbalance in the vaginal environment and a possible infection in the organism. Under normal conditions, estrogen thickens the vaginal squamous epithelium and increases the glycogen content, which is converted into lactic acid by Lactobacillus, maintaining a normal acidic vaginal environment, i.e. pH ≤ 4.5, with a normal vaginal pH of about 3.8-4.4. Besides maintaining an acidic vaginal environment, Lactobacillus also inhibits or kills microorganisms and prevents pathogenic microorganisms from attaching to vaginal epithelial cells, thus maintaining the vaginal microecological balance. Frequent sexual intercourse and vaginal irrigation can increase the pH of the vagina, e.g. up to 7.2 after sexual intercourse, and long-term application of broad-spectrum antibiotics can also inhibit the growth of Lactobacillus. Therefore a small amount of lactobacilli is also common in the following diseases: 1. Vulvovaginal pseudomycosis: excessive proliferation of fungi can lead to vulvovaginal pseudomycosis, which manifests as vulvar itching, burning pain, tofu sludge-like or curd-like vaginal discharge and the appearance of a small amount of lactobacilli; 2. Trichomonas vaginalis: trichomonas can consume or engulf glycogen in vaginal epithelial cells and hinder lactic acid production, which can This can lead to an increase in vaginal pH. It is a common sexually transmitted disease that often occurs around menstruation. 3. Bacterial vaginitis: The main causative agents are Gardnerella, anaerobic bacteria such as Bacteroides, Streptococcus digestiveis, and human mycoplasma infections. This is manifested by an increase in thin vaginal discharge with a fishy odor, but no inflammatory changes in the vagina. Therefore, patients need to look for the cause of the small amount of Lactobacillus based on the test results, and then to provide targeted treatment.