Before I can give advice about to reducing the swelling, it is important to understand the cause of the swelling. If you have a random swelling in your ankle that you are unable to explain, then this is something that should be addressed by a doctor
in person rather than trying to fix it yourself. It could be a sign of a serious medical condition such as a blood clot that may need immediate medical attention. If instead you sprained your ankle and it is responding in a predictable fashion, then perhaps some conservative therapy such as elevation and ice packs may be beneficial to reduce the swelling. In the proper context, other conservative therapies such as non-steroidal anti-inflammatory medications (such as ibuprofen or naprosyn, each of which should be taken with food) can help to reduce swelling. The key again is that you should speak with your doctor about your condition and determine what the best course of action in your specific situation should be so that you can start feeling better as soon as possible. Conservative therapies may not be appropriate if you have something more causing the swelling. Please speak to your doctor.