Yes, that could be the lupus. Occasionally my toes feel like someone has injected hot burning oil into them! Or I might get a swollen inflamed joint like your ankle. Usually you can look at your current bloodwork and you'll see increases in your inflammation markers which will confirm it's Lupus playing with your body.
Lynnwood, Lupus & Sjogren's ModeratorDIAGNOSING-LUPUS & LUPUS-RESOURCES
"Life is far too important to be taken seriously" - Oscar Wilde