Hi
If you have sprained your ankle, just a Hansaplast heat plaster won't work. It will only give you temporary relief. Your ankle needs to be given adequate amount of rest.
*Apply a crepe bandage over it. Don't apply it too tightly...keep it comfortable. But keep it on 24 hours a day. Keep it on at night also. You should only remove it while having a bath. Besides bathing, you should remove it 5-6 times a day, apply ice over the painful region and then apply the bandage back again. Apply this bandage in this manner for 20 days.
If, after 20 days, the ankle is still painful, you may need an MRI.
Next Steps
Follow the above steps and do let me know if you have pain relief after 1 week.