Get it fixed: The two likely causes are a blood clot or a knee joint cyst/rupture. If a clot, you will need to get help to get it dissolved, as it presents a danger of moving to our lung and seriously injuring you - even death. If it is a ruptured knee cyst, it can easily be drained and give you some relief. Diagnosis is easy -- so don't delay,
Answered 8/14/2015
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