Hello, Welcome to HCM, There could be two possibilities in your case. First, bacterial infection of the belly button area. Second, incisional hernia. For first case, clean the area with spirit and apply polyfax plus ointment thrice a day for a week. For second, you need to visit hospital where doctors will confirm it by examining it. If I were your doctor, I would advise you for an ultrasound of the abdomen to know the origin of the swelling followed by a CT/MRI scan if need be. Further management would depend on the physical findings of a clinical examination by a gynaecologist and the reports of the investigation. The management as it seems to me from the history alone would possibly be surgical. Therefore, I would advise you to take an appointment with your doctor. Thank you.