My left ankle was swollen for about a week then
Thanks for posting your query.
Most common cause of swelling in feet without trauma in case of long standing is varicose vain. In this case swelling decreased in night and morning and reappear in evening.Do hot water fomentation,applied compression bandage , you will get relief. If possible kindly attached photo of your ankle so that I am able to guide you properly.
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Dr. Praveen Tayal.