I have spots that look like 'diabetic dermopathy;' if my blood sugars are normal fasting and after meals, what else can it be?

Could still be DD. The classic differential diagnosis of diabetic dermopathy (sometimes only separable by biopsy) is granuloma annulare and the rash associated with rheumatoid arthritis. But it could still be diabetic dermopathy, even if you don't have diabetes. (some believe such eruptions are a harbinger of future diabetes.) you'll need a dermatologist to sort this out.
Tinea. Yeast infections, autoimmune phenomena, drug reactions and infections can all cause skin lesions similar to diabetic dermatopathy. Consult an experienced dermatologist for advice.