Hi,I had gone through your query and understand your concern. If I were the treating physician,I would first emphasize on wound management(regular dressing,antibiotic,tetanus toxoid injection etc.) Simultaneously treat to control blood sugar strictly.If sugar remains high,wound healing will be delayed I presume that any wound of diabetic patient should consider with the highest priority. So my opinion is : Contact with a specialized diabetic Hospital ,so that your father can get proper management under close monitoring and good control of blood sugar. Hope this helps you.If you have additional questions or follow up queries,please feel easy to write us. Wish your father good health.