Hi Maggie,
I have now lost 91 lbs, and my swelling has gone down a lot, but not completely. I talked to my doc about it, and she didn't really give me much of a sense of the cause, but she said she thought it was due to inflammation. She suggested I wear an ankle brace for a month to reduce the swelling and to take alleve. I can't say I've been consistent with either! But, when I do those things, the swelling seems to be better. For me, it's much worse in my left ankle, which I injured a long time ago, so this might just be something that I have to live with.... I hope that helps a little...