hello thank you for contacting HCM u might have ankle injury while jump. it may be strain, sprain or bone fracture after landing in some awkward position. please apply elastic bandage and take rest. don t put pressure on leg. continue ice massage and elevate yr leg so pain and swelling will gradually decrease. use paracetamol to reduce pain. if pain persist and difficulty in walking and still swelling, consult yr orthopedic dr and get the x ray done to rule out the cause of injury. hope this will be helpful to u. take care