I had very bad seroma after lumpectomy. Draining only helped with one. I had to have the other packed every day by the nurse. It put off my radiation by 2 months. During that time, I did get an infection by my surgeon was on top of it and gave me antibiotics. After radiation and removal of many lymph nodes, have lymphedema and bad pains under arms where most of modes were removed. Going for OT and wearing compression garments is helping. Best is self-massage, several times a day to deal with pain.