Small rashes on the vaginal opening may be caused by vulvar squamous epithelial hyperplasia, condyloma acuminatum, genital herpes and other factors. 1. Vulvar squamous epithelial hyperplasia: a benign hyperplasia that may be associated with repeated scratching and may be accompanied by symptoms such as rough and flaky skin. 2. Condyloma acuminatum: usually caused by human papillomavirus infection, which can lead to small rashes on the vaginal opening and vulva, in the shape of papillae or cauliflower, accompanied by mild itching, rapid growth, and more contagious. 3. Genital herpes: may be related to herpes simplex virus infection, most patients have unclean sex, in the beginning will make the vaginal opening area appeared small pimples, accompanied by itching as well as tingling, can be ulcerated, erosion. If you have a small rash on the vaginal opening and there are other abnormalities, it is recommended that you seek medical attention for appropriate examination and treatment to avoid other complications.