1 yr PO and still got my fat necrosis. Will the necrosis still shrink? is there any danger to keep it in?

Fat necrosis, whether in the buttock or elsewhere, usually involves
the feeling of a hardened discrete mass that is the calcified dying or
dead fat.  Treatment may include massage, tincture of time, as most of
these go away with time.  Occasionally, these areas may have to be
excised.  There are probably multiple reasons for this to occur, some of
which are not entirely preventable.
These revision surgeries after previous BBL and fat necrosis can prove challenging.  The depth of fat necrosis as well as the amount will determine success to some extent. Both procedures can be performed during one surgery.  The revision implies that scar tissue will make the surgery much more difficult on the surgeon.  This needs to be done very carefully to avoid skin sagging. This can be tricky as skin and tissue distensibility  may preclude any further improvement in shape or dimension with revisional attempts. Selection of a PS who has performed numerous successful  BBL revisions is key to the outcome.

Dear Plasticgirl2018,
incase of fat transfer, 30-50% of fat is lost after the surgery and some of that lost fat is turned into fat necrosis. Smaller areas of necrosis can heal with time, while bigger ones can't and a surgery might be an option to remove them. It is best that you visit your plastic surgeon for further assessment. Only after thorough examination you can get proper recommendations and advice.
Daniel Barrett, MD

The lumps you are feeling one year post op are probably not fat necrosis but scar tissue  you should ask your plastic surgeon to inject them with Kenalog 40, a steroid, which should soften them significantly Good luckDr T