Hematoma after mastectomy

I had a mastectomy 16/11/16 and had seroma asperated every week for 3 months. Then a month ago I developed a Hematoma, I have been seen by my Breast surgeon and my Breast Cancer Nurse has asperated 70 to 100 ml blood every week, but it still is filling up like I'm growing a breast again.. Has any body had similar and how long did it last, I'd appreciate any advice.. :-

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