There are many reasons for the redness and swelling of the labia, which can be divided into the following aspects: First, it may be caused by gynecological diseases, such as vaginitis, acute vulvovaginitis, and so on, when the disease appears, the female patient’s private parts will feel swollen, congestion, and burning sensation, and in severe cases, there will be swelling, ulcers, eczema. Secondly, it may be caused by allergy, if women use unclean sanitary napkins or toilet paper in normal life, it may cause allergic reaction, thus redness and swelling. Third, it may be due to trauma caused by labia redness and swelling, such as female patients in cycling or labor injury to the perineum will cause labia redness, swelling, pain, will lead to female labia redness and swelling, in addition to the female patients when the sex life is too frequent can also cause this situation.