If it's purple, you need to get to Doctor as you might have cracked a bone or severely sprained it. About 15 years ago I was bouncing down the back steps from Ground floor to basement (where my work area was) I missed the last two steps and took a header down the steps. I landed on my stomach and chest with arms in front of me like Superman Flying.
I had to see manager, and he had to fill out accident report. They took me to ER to X-Rate my right ankle as it had turned Purple. I also had to take that darn drug test. (Passed with flying colors) That was clean. However, I had pulled several tendons in my Right Ankle.
I was in a soft splint and on crutches for about two weeks. On occasion, mu Right Ankle hurts like the dickens for about 30 minutes. I just turn my foot around and back and too using the ankle to propel the foot. So, yes, years from now, out of the blue, that ankle will bother you.
Just wiggle it around and back and two using the ankle muscle to do this. I feel your pain. Tylenol will ease the pain.