Having fluid accumulate after a lipoma is removed always happens, to a degree. It is just a question as to whether or not the body resorbs it faster than it is being made. Whether or not you notice fluid depends on where the surgical site is (i.e. is it in a place close to the skin that is moving a lot? or having pressure put on it from sitting or lying down?) and how much surgery was done (i.e., how big a lipoma was removed). At a certain point, the tissue tightens and feels hard, and "learns" to soften up again. Its hard to tell from your question what the pain complaint is. If it is pressure and more fluid, then repeated drainage or drain placement is the answer. If there is not a lot of fluid to speak of, it may just be the healing process which is uncomfortable, but is temporary. At 4-8 weeks, usually the process is the "worst", which is where you are now anyway. Your doctor may want to make sure this is the case, so call he or she if you have concerns that haven't been addressed for sure.