My Left Ankle Is Red And Swollen And It Is

My left ankle is red and swollen and it is hard to get my shoes on. It tends to go down a little over night but by the time I have done a few chores it is back up again, sitting around does not make it any better. It also has a lot of dark blotches and what looks like bruising around the lower part of the ankle joint. The hot weather seems to be making it worse. I have had this for quite some time and take fluid tablets which was supposed to help but that has not happened.