Hello, Thanks for posting, From your description it sounds to me that you have reinjured an old injury without necessarily twisting or traumatizing it, but the fact that you played football must have strained the old injury, hence you developed the new symptoms. Sprain injury could heal pretty rapidly with disappearance of pain and swelling, but it does not mean that the affected muscle tissues are completely healed. Purplish red ankle may signify petechia which is as a result of poor blood supply to the blood capillaries underlying the skin (this could still be as a result of the injury). You will require some ice packs and some analgesia or NSAID (such as ibuprofen or aspirin) to treat the pain and may also require to wear braces and have some bed rest to allow good healing process to take place. Massage with topical antiinflammatory might be of great use. Consult with an orthopedic surgeon if possible. Hope this helps