Generally RICE: which is Rest, Ice, Compression, Elevation. Can try Ibuprofen which is good for inflammation as well. Could also try aspirating (draining) possible shot of corticosteroid.
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to do aspiration by yourself? No, there are too many risks involved. It could do more harm than good. If it is due to an injury it may heal on it's own. I don't know your full medical history. If left untreated it could form calcium deposits, sometimes causing permanent reduction in movement. Also it is possible infection could set in as well, but as I stated without knowing your full medical history and test results etc.. it would be hard to say what the long term effects would be if not treated properly or in a timely manner. It is something you should talk over with your doctor since he has seen you and has your results.
Hope this helps Hun