I would like you to describe your wound, whether it is an open wound or a closed wound with a swelling and blood clot. Have you gone for an X-Ray or MRI? Did you experience any twisting in your ankle while getting injured?
If it is an open wound, you will have to do a regular dressing with betadine ointment application twice a day and also rule out factors like diabetes since it is taking time to heal.
If it is a closed wound, you will have to keep an ice pack for 10 to 15 minutes twice or thrice a day and also start with ankle toe exercise. Keep me updated so that I can help you with your problem.