Normal wounds heal by forming scars n scabs but that usually takes a week to form n shed away in a month or so depending on size n extent. Diabetes is obviously a delaying factor. U should look if there is any purulent discharge or pale yellow granulation tissue formation. If yes then get them dressed. Also u need to monitor ur blood sugar fasting n p.p . HbA1c levels gives a good idea about long term control. If u want further assessment then u can get color Doppler of limbs done. They will tell u about your blood flow. Also if u haven t got tetanus shots I recommend u get them asap