Ice it. Ice your injury for 20 to 30 minutes every 3 to 4 hours to reduce pain and swelling. Continue this for 2 or 3 days, or until the pain is gone. Compress your leg. Use an elastic bandage around the lower leg and ankle to keep down swelling.
Finally, two terms you may run across in the future are oxidizing agent (or oxidant) and a reducing agent (reductant). An oxidizing agent causes oxidation and is reduced in the reaction. A reducing agent causes the reduction in the redox reaction. The reducing agent is oxidized in the reaction.
The diagram above shows that the oxidizing agent gains electrons from another substance, which is the reducing agent. When an oxidizing agent gains electrons, it gets reduced, and, as a result, oxidizes the reducing agent. It gets a little confusing since similar words are being used throughout.