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Where did you kneel on the carpet? Was it on the edge of the carpet or along a seam in the carpet? Do you have pain in your knee now when you walk?
Hmm. This sounds concerning. It is possible that you may have an acute infection of the knee from either something that entered the knee when you kneeled down. Or you may have something such as a gout flair up causing this pain and swelling. This would be considered an urgent problem that you need to get in to see a doctor immediately about. I would recommend that you go to an urgent care center or the emergency room. They will need to do an examination and an x-ray of your knee to see if you need to have an aspiration of your knee or be started on antibiotics. You cannot delay this treatment as an infection of your knee could cause severe mobility problems in the future. Hope this helps.