Hello, thanks for the query.
, if not treated is dangerous. You haven't mentioned the type of diabetes and whether it is genetic or other reason.
Small brown spots over leg and arm, are related to diabetes and these spots may be blisters , which are very common among diabetics.
You should check your blood and urine regularly for diabetes whether it is under control or not.
This is the habit of diabetic patients that they become careless after some time of disease diagnosed .
If these type of blisters ( brown spots ) forms over fingers of leg of hand , please be careful and take full course of disease.
If possible visit a nearby diabetic clinic and they will treat you carefully.
Best of luck for recovery. Dr. HET.