What causes swelling and pain in the external genitalia during the late stages of pregnancy?

Patient's question:

There are 5 days until the due date
Vulva swelling and pain these days
What should I do

Doctor's answer:

Late pregnant women may experience swelling and pain in the external genitalia, possibly suffering from vulvitis. This is primarily caused by increased intra-abdominal pressure, obstruction of venous and lymphatic fluid return in the lower limbs, poor blood circulation in the vulvar area, and susceptibility to bacterial infection. It is recommended to maintain vulvar cleanliness, drink more water, get more rest, avoid prolonged standing, consume more fruits and vegetables, and slightly elevate the lower limbs while sleeping. Diluted potassium permanganate can be used to wash the vulva.