How to Get Rid of a Very Large Breast Hematoma S/p Mva from the Seatbelt It is Approx 7cmx3cm?

Thank you for the question.

Unfortunately, there is not enough information in the question to provide you with precise advice. For example, if a true fluid (blood) accumulation is present (hematoma) then a drainage procedure may be necessary. On the other hand, if what you are experiencing is a significant area of ecchymosis (bruising) then time ( and no surgical intervention) will be necessary.

In person examination by well experienced board-certified plastic surgeons will provide you the best source of advice/guidance.

Best wishes.

I am unable to determine from your question whether or not you have recently had breast surgery.  You will need an examination and possibly surgery to drain the hematoma.  Small hematomas may be observed as the body will take care of them.  Larger ones need to be drained. The bottom line is that you need to go in to see a Board Certified PS to determine the best course of action.