Unmarried women with itching and pain on one side of the lips of the vulva may be caused by vaginitis, vulvitis, vulvar eczema and so on. 1. Vaginitis: clinical symptoms manifested as an abnormal increase in vaginal secretions, often yellow pus, with a fishy odor, as well as some of the patients complained of vulvar, vaginal itching, which can lead to unmarried women, one side of the lips of the vulva itchy pain. 2. Vulvovaginitis: vulvovaginitis may be caused by local pathogen infection, may also be related to physical, chemical and other factors related to stimulation, which can lead to unmarried women, one side of the lips of the vulva itchy and painful, red and swollen and other symptoms. 3. Vulvar eczema: if unmarried women usually do not pay attention to personal hygiene and cleanliness, and the perineum is in a humid and hot environment, long-term easy to lead to vulvar eczema, unmarried women vulvar lips side of the itchy and painful, erythematous, pimples and other symptoms. However, it is important to note that unmarried women with itchy lips on one side of the vulva, there may be other reasons, it is recommended that when the symptoms appear, timely medical care to identify the causes, and then targeted treatment.