Very often with high blood sugars going untreated for long periods of time you're quite prone to fungal infections.
Often simply cleared up with a cream or some pills from the docs.
With diabetes we need to watch and listen to our bodies more often and carefully, observing changes. Often a trip to see your GP isn't needed, your local pharmacist is a good source of information (well worth, in my opinion having just one pharmacy for all your prescriptions, then they know exactly what you have and can tell you any interactions etc), failing that the GP nurse is also a good person to decide if you need to see the doc or not.