Hello: generally, your condition is caused by soft tissue infection caused by foreign bodies left in foot tissue. If you can't heal for a long time, you can go to a general hospital for debridement, full drainage, discharge of inflammatory substances, and regular dressing change until you are cured. You don't have to go to any big hospital There is no medicine for your wound to heal quickly in big hospitals. What you need now is time. I hope my answer is helpful to you.