Talk to Endocrinologist on Diabetic Injury

Posting for my father ,aged 54 Is a diabetic patient ( since 20 years ) had a small injury on his feet (heel) , at first it looked normal but after some time , heel bone got swelled with white - yelloish fluid liquid and after checkup from a nearby doctor , he recommended a mini operation to remove the infected area as it can spread on the whole feet so after considering we opted for the operation and doctor removed almost 40 percent of heel and dressed it after cleaning it with piyodine and spirit . I need recommendations from the doctor wether we should stick with this medicine or go for the specialist doctor and is it dangerous ? Or patient can get cured in this situation ? doctor has suggested some medicines which are attached in image section Please can any relative doctor tell me about the medicines doctor has recommended are they known and worthy ?