Conversation: The conversation between human and AI assistant.
[|Human|] About a week ago i fell and hit my knee. It did not bruise, but my knee hurts when I kneel. I looked at my knee today and noticed a bubble of sorts that hurts when I touch it. Is this pooled blood? If so, do I have to have it drained or do I just wait it out?
[|AI|]  Hi, In your case, there are few possible causes and if there was no injury then some other chronic disorder may be present. Without more information it is not enough to determine the diagnosis. It could be a hematoma (bleeding in the tissues) or a swollen knee joint capsule. If it's in the back of the knee then it could be a Bakers cyst. Clinical examination (and perhaps fluid aspiration if there's any) would help to determine the diagnosis. Either an orthopedics specialist or your primary care physician can do that.  Until then, you can try to apply ice packs (not directly on the skin - wrap them with a towel) and perhaps use some painkillers starting with paracetamol (acetaminophen) and advancing to NSAID if paracetamol is not enough and there's no contraindication for NSAID. Hope I have answered your query. Let me know if I can assist you further.