There are many reasons why women have red blood spots on the vaginal opening, and they are considered to be related to not paying attention to personal hygiene, gynecological inflammation, allergic dermatitis and other factors. 1. Don’t pay attention to personal hygiene: If women don’t pay attention to personal hygiene, don’t wash the local skin or change the underwear in time, due to the mucous membrane of the vagina will secrete a small amount of mucous material, which may cause the local breeding of bacteria, thus causing the local skin to become congested and red and swollen. 2. Gynecological inflammation: If there are gynecological inflammations such as vaginitis and pelvic inflammatory disease, due to the stimulation of inflammatory exudate and inflammatory factors, there may be excessive leucorrhoea, vulvar itching, and local congestion. 3. Allergic dermatitis: If a woman is allergic to chemical fiber and other clothing, it may cause the accumulation of local histamines, resulting in a large red localized rash, accompanied by obvious itching and other symptoms. Women with red blood spots on the vaginal opening may also have other reasons, it is recommended to go to the regular hospital in time to improve the relevant examination, clear causes under the guidance of the doctor targeted treatment.