If your BGs are in a good range then you should heal as well as anyone else, high sugars can cause slow healing and infection. Keep it clean and dry, not medical advice but me personally I wouldn’t cover it unless your clothes are on it or you have a chance of getting dirt in it. Gauze on a wound that is just staring to heal over can stick to the wound and cause more problems
Keep an eye on it and if you are at all worried maybe get advice from your local pharmacist (I find them very knowledgeable and much quicker than trying to get to see a doctor or nurse)