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A member asked:
A bump appeared behind my knee about two weeks ago, i thought it was a blood blister but it hasnt went away yet. it kind of looks like one but not really so im not sure what it could be?
A doctor has provided 1 answer
A bump behind the knee can have various causes, including injury, infection, or a cyst. It could be a Baker's cyst a quite common cause of a bump behind the knee. It is a fluid-filled sac that forms in the back of the knee joint. In some cases, a Baker's cyst can be a sign of an underlying condition such as rheumatoid arthritis or osteoarthritis. It might be a popliteal lymph node.
Answered 6/11/2023
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