Swelling of the genitals is a symptom of various medical conditions, including infections, hormonal imbalances, and trauma. It can appear as a localized area of swelling, or as a more generalized enlargement of the genital area. It can range in size from a small lump to a large mass. It may be accompanied by pain, itching, or warmth. It may develop suddenly or gradually. It is important to seek medical attention if the swelling persists or worsens.