See your Orthopod !: Sudden appearance of a painful & tender swelling in the leg could be due to a number of causes. It could be from a fall or stumble resulting in a fx or torn muscle; or due to an infection. All these would be associated with a history of a trauma or fever, etc. Rarer causes include a bone tumor breaking thru, resulting in sudden swelling, pain & tenderness. Bleeding vessel might also cause the same.
Answered 12/27/2020
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