There are many skin conditions which can be caused by uncontrolled diabetes
and this includes bacterial infections,fungal infections,diabetic dermopathy ,diabetic blisters
Your symptoms suggest that you may be probably suffering from diabetic dermopathy.
Diabetic dermopathy looks like brown scaly patches which may be oval or circular.
These patches generally occur on front of both legs and are harmless and dont itch.
This does not need any treatment,however you are advised to consult a dermatologist
for the exact diagnosis of your cause.
I hope it helps.