Prolonged Swelling (2 Weeks or More) After Lymphatic Massage

I had tummy tuck 9 months ago, also have been diagnosed with fatty necrosis in the lower abdominal area. I have received 2 sessions of lymphatic massage, the last one being about 2 weeks ago. Since then, I have experienced an increased amount of lower abdominal swelling, which doesn't ever seem to cease, day or night. The massage session consisted of a somewhat aggressive approach to my lower abdominal area for about 20 minutes or so. I am no wondering if the massage was done incorrectly.