I have a cinnamon sore that never heals ... What can it be?

I have a cinnamon sore that never heals, they say it's because I do not stop scratching it but I've left a bandage on it for months and there has not been any improvement, it's dry and it's that crust. Is there any kind of treatment? What can it be?
Expert answer:

The diagnosis of skin lesions is usually made by direct observation of the lesion, without seeing the wound it is difficult to hit the diagnosis, then I would be kicking and maybe I would hit by luck. Ideally your case (long-standing wound) would be to do some exams of the wound, look for a dermatologist.