Scar Tissue?

Within the past 3 years I have broken and sprained my ankle many times. It often seems to crack, and is often swollen for no apparent reason, maybe depending on how it is bent, how I sit, etc… Also, it tends to hurt very much at times. Is there somthing wrong with it? Could it maybe have somthing to do with scar tissue, and it not healing correctly the first time? If so, any suggestions on how to take care of it efficiently?