This is just a single joint and from what I can gather, there seems to be no other complaints to suggest a systemic process such as RA given that this has been present for 3 months. If there was preceding trauma, one might consider a traumatic synovitis. If there has been or was a rash or fever, one might consider juvenile idiopathic arthritis or adult Still's disease, but this is unlikely.
Answered 4/8/2022
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