Do you have a roll of old fashioned gauze bandage? Wrap that around the bruising, green and grey color on the scales. Then find something about and inch or inch and a half long that's rigid. Make sure it has no sharp edges that can cut the leg. Look in your junk drawer. I know you have one. We all do.
Place these two rigid but thin objects on each side of the gauze on the sides of the ankle, then wrap with elastic bandage to hold everything in place. Be sure to wrap tightly enough so it doesn't slide, but not too tightly it cuts off circulation.
You will unwrap and check the ankle after 24 hours. You will look for swelling above and below your bandage, which would indicate you had the bandage too tight, and look at the break itself for swelling. Rewrap and check again in forty-eight hours.