Bilateral Mastectomy... Right side swelling daily (photos)
Doctor Answers 1
Post operative swelling
More than likely it is a seroma, or build up of fluid at the surgical site that was being wicked away by the drains, but is now accumulating. It is not dangerous and your body will take care of it, but as this looks uncomfortable, I would recommend calling your surgeon to see if it can be drained through the skin.