An H-value of 5.4 refers to an elevated pH level in the vagina, which may lead to vaginal inflammation, such as vulvar itching, accompanied by an increase in vaginal discharge. The normal pH of the vagina is less than 4.5, with a normal range of 3.8-4.4. The vagina itself is self-purifying, and the three main elements that keep the vagina self-purifying are estrogen, Lactobacillus, and pH. A certain level of estrogen can promote the proliferation and hypertrophy of vaginal epithelial cells, and the glycogen content in the cells will increase significantly. The good bacteria in the vagina, that is, the dominant bacteria, is Lactobacillus, which can convert the glycogen in the vaginal epithelial cells into lactic acid, thus keeping the vagina in an acidic environment, which is the self-purification function of the vagina.