It's only my right ankle and my left ankle has no fluid. The right ankle is very swollen.
Where is the pain worst? Is it in the center of the joint, on the outside(lateral or little toe side) or on the inside(medial or big toe side). ? Does it hurt to move it up down or more side to side? What about the back where the achilles is, does that hurt? There are no muscles around the ankle joint, only tendons, ligaments, nerves/blood vessels, and the joints themselves. So if you can poinpoint the pain perhaps I can tell you more .
Also rule out psoriatic arthritis(do you have any psoriasis skin lesions?) and rheumatoid arthritis as they can both swell an ankle.