The swelling of one side of a woman’s private part may be caused by trauma, soft tissue skin infection, vestibulitis, allergies and other factors. 1. Trauma: If a woman’s private parts are impacted or squeezed by external forces, it can easily lead to the swelling of one side of the private parts. 2. soft skin infection: when a woman suffers from inflammation or folliculitis of the soft skin on one side of the vulva, it may lead to localized swelling, manifesting itself in the phenomenon of swelling on one side of the vulva. 3. Vestibular adenitis: mainly associated with the vestibular gland ducts blocked, the secretion did not flow out in time, will easily lead to infection, not only will appear on one side of the private part of the swelling, but also may appear swelling, pain and other symptoms. 4. Allergic factors: when a woman is exposed to allergic substances, it will be easy to have an allergic reaction, which may also lead to the symptoms of one side of the private part is swollen. There may be other reasons why a woman’s private parts are swollen on one side, so it is recommended that she consult a doctor in time.