Its very important to look out for signs of infection or dead tissue - red infected flesh around the wound, pus, changes to the colour and texture of the flesh, smells... any of those, no matter how small the wound, and get to a surgery ASAP. Or A&E (ER) if the change comes on suddenly.
Other than that, I kind of think we should just apply common sense, and weigh up how good our blood glucose control is, and how fast we used to heal compared with now.
The problems get more likely the higher our HbA1c is (that seems to be true about most things!), so if your HbA1c suggests that healing may be slowed or impaired, then close monitoring makes sense.