Suggest Treatment For Itchy Ulcers In Diabetics

i am diabetic and am on metformin and byetta, for the last 4 years i have suffered with sever itching and as a result have caused an ulser i have used every cream known to man i think and have last used daktacort i kept it in the fridge and it has eased a lot but when i use my epaderm i can feel like a crusty head on a pimple will it ever go