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You need to go to the emergency as soon as possible to have this evaluated.
I would like to rule out/rule in a clot in the deep veins of the legs that can be a cause of this and this would require immediate treatment with blood thinning medications like heparin followed by warfarin once the diagnosis is confirmed.
So the main possibility with your symptoms i.e. a swollen and painful leg is a clot in the vein of that particular leg that requires a visit to the emergency as soon as possible.
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