The Top Of My Left Foot And Left Ankle Are

The top of my left foot and left ankle are swollen and have been for a few days now. If I elevate my leg, it goes down, but after a couple of hours, it swells again. If I press on it, it leaves an indention. It is not very painful, but is starting to become uncomfortable. This has been going on and off for over a week now. I am 53 years old and a female. I am post menapause and have Graves disease. I use to have another rare auto-immune disease called Factor 8 Inhibitor, but that has been in remission for nearly 20 years now. What do you think my swelling is a symptom of and should I seek immediate medical attention? My email address is YYYY@YYYY