Hi There
is your diabetes well under control?
as said above if your levels are a little high and you have excess glucose in your urine it can cause a problem, you will usually find a thickening of the skin there, as well as an almost waxy texture to it, try plenty of fluids to dilute your urine and a dab of Bepanthen or similar cream will help prevent further irritation
hope that helps in this delicate matter, but dont hesitate to speak to your doctor about it
Crofty