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.
A reducing agent will react spontaneously with any oxidizing agent stronger than the oxidizing agent with which it is coupled. Hence Pb will reduce H+(aq), Cu2+, Ag+, Br2 etc but not react with Zn2+ or Na+. Consider a series of elements Cu, H 2, Ni, Zn and their ions. These four elements could act as reducing agents.