How do i cure body rashes that result from diabetes. I also experience body itching.?

My diabetes was diagnosed about 12 years ago. Since then I have treated the diabetes with diamicron and the rashes with diprosone cream. I am not down sick. Infact am strong, apart from occasional weakness.The rashes are widespread and respond to treatment sometimes but refuse to go completely.I dont know what to do. Thanks for your useful answer.