Hard lump in breast after second surgery

I recently had to have a second surgery after my initial lumpectomy (wide excision with a Perforator flap, removal of DCIS and malignant tumor in left breast) to remove a margin of tumor left behind. After the first surgery, everything was healing and going well. The second surgery however has not gone as smooth. My breast has been very heavy, red and swollen and I ended up in emergency, an ultrasound was performed and 2 pockets of fluid have formed under the skin. I have had both of these drained this week, but I still feel that there is a hard lump and some pressure pushing around the area. It has now been 2 days since the fluid was drained. 

Has anyone had this happen to them? Does it take time for the pressure to go away? Is this all part of the healing process? Thanks :-)