The redness and swelling of a woman’s lower body are usually considered to be caused by vaginitis, vulvar boils, violent sex, etc. It is also necessary to judge according to the specific symptoms of the patient. 1. Vaginitis: due to improper cleansing of the lower body, the local environment is humid, bacteria breeding infection, secretion of a large amount of secretion, leukorrhea increase, local redness, swelling, itching and other uncomfortable symptoms. 2. Vulvar boils: If the patient’s vulva is wet for a long time, and the clothes, pants and sanitary products are not breathable, it can be infected with Staphylococcus aureus, which will lead to suppurative inflammation in the deep part of the hair follicle and the surrounding tissues, and vulvar boils will appear. 3. Violent sex: If too much force is exerted during sex, resulting in female vulvar injury, it can also lead to redness and swelling of a woman’s lower body. There may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.