I mildly sprained my ankle (no bruising) and didn't take it seriously for about a month. now there's no pain, just light swelling. how do i heal it?

See below: Try using ice for 20-30 min twice daily. Get a compression brace, not an ace bandage, to wear daily but not at night, for 7-10 days. See if this helps, if not see a podiatrist.

Ice ice brace it: For first line treatment, ice, rest and brace it. Antiinflammatory meds can help decrease swelling and pain. It takes 3-4 weeks for ligaments to heal. If it continues to hurt after 1-2 weeks, seeing a physician for standing x-rays and exam in case you may have damaged your ankle more severely than first thought. Hope this helps!