My index finger suddenly swelled up this evening No injury

Patient : My index finger suddenly swelled up this evening. No injury or anything I can think of that may have triggered it (was in cinema watching film). It's very swollen and painful (to touch 3/10 and move 5/10) from base to middle joint. Have iced and taken ibuprofen. I am in my early 30s and female. Medical history: epilepsy (lamotrigine 100mg bd) and recent surgery for osteoarthritis in ankle. I take no other regular medication, though took paracetamol throughout day and last night as had stomach cramps. No other current or past medical issues. Family history of DVTs. Any thoughts?
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My index finger suddenly sw...-1
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