What Causes Discolored Spots On Neck With History Of Gestational Diabetes?

Hi, My name is Elisavet i am 23 Years old. I was pregnant with my daughter when i found out i have GD i though it would go away but it did not. My doctor did tell me to treat it with injecting myself with medication to keep it elevated. But i did not. Now 10 months passed and two white spots appeared on the back of my neck they are really dry. I m afraid it might be dut to my diabetes. Can the diabeted caused the 2 white spots on the back of my neck and how can i treat it??