Our expert says:
I'd be guessing - did you bump it, could it be a bite of some sort, maybe you rolled over on the ankle? It's impossible to just guess without any history - I mean, did you wake up one morning and there it was, or did it develop over a period of a week? Is there anything you can think of that's happened to possibly cause it?
I think ultimately, you'll need to go see a doctor and have it checked out, because only on examination can you have a diagnosis - this forum can't provide that, unfortunately.
So while I hate passing the buck, I have to on this one.
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