Hi , thanks for your query.
Wounds tend to take longer to heal in diabetics.Strict control of blood sugars will help, along with regular dressing and antibiotics. Doppler checks the blood flow in the larger blood vessels.This was done to check for for sluggish blood flow which will hamper wound healing
.It is difficult to predict when it will heal completely, usually 4-5 weeks.
Thank you. Have a healthy life.