Swelling on one side of the external lips of women during pregnancy can be treated through observation and topical medication. 1. Observation: After pregnancy, the hormone level in the body has obvious changes, which may affect the water and sodium retention, resulting in vulvar congestion, skin thickening, connective tissue flaccidity and other phenomena. This is a physiological phenomenon, does not need special treatment, you can observe, pay attention to cleanliness and hygiene. 2. Medication: If the swelling of the vulvar lips is accompanied by other symptoms, such as abnormal secretions, itching, pain and so on. Then it is recommended to consult a doctor in time to see whether the combination of bacterial infection, fungal infection, etc., is the need for timely treatment, to avoid upstream infection affecting the fetus. If you have any discomfort during pregnancy, it is recommended that you consult a doctor promptly.