Conversation: The conversation between human and AI assistant.
[|Human|] Hi, my knee has come up in a bruise for no reason. i notice that in the centre of the bruise is a peas sized lump. I have had a operation to remove a previious nodule on the bone about an inch away from the area but this is anot one of those. any idea as its quite painful and the bruise seems to originate form this
[|AI|]  Welcome to Chat Doctor .1. The history suggest an infective etiology of a lump / collection within in a post-operative site.2. It could be infective collection adjacent to the operative site, which needs to be assessed properly.3. At this point get an x-ray knee joint AP/LAT to have an overview of the pathology. 4. An ultrasound to assess the nature of the lump and source and where all it is extending. 5. In case of infection without internal involvement - a course of antibiotic will be enough with symptomatic treatment. Good luck. Hope it helps you. Wish you a good health. Anything to ask ? Do not hesitate. Thank you.