Redness and swelling of the labia minora can be caused by the following reasons: First, trauma, if the perineum is injured accidentally while cycling or working, it may lead to redness, swelling and pain due to the injury of the labia minora. Second, caused by allergy, if you use unqualified sanitary pads during menstruation, or do not change the pads diligently, resulting in repeated friction and infection of the labia minora and redness and swelling, it is recommended to pay attention to personal hygiene during menstruation and choose qualified, soft and breathable sanitary products. Third, consider gynecological inflammation, due to inflammation reaction leads to abnormal secretion increase, repeated stimulation of labia, vulvar skin and redness, swelling, itching and other symptoms, need to timely specialist diagnosis and treatment, and actively to be anti-inflammatory drug treatment. Fourth, it is considered to be too strenuous during coitus, or the number of coitus is too frequent, resulting in labia congestion, redness and swelling, it is recommended to prohibit sexual intercourse in the near future.