I have spots of rash covering two or three square inches on my legs, could they be related to diabetes, I have never been diagnosed. 44 male?

Many possibilities. There are many types and causes of skin rashes that could cause itching. Several types of inflammatory conditions of the skin, allergic reactions, and sometimes bacterial, viral or fungal infections can cause rashes on the skin. Insect bites can also be the cause of a rash on the skin. Have it evaluated by a professional and get the appropriate treatment.
Cannot say. Without a picture or more description of your symptoms it is hard to say what your rash is.I would suggest you see a dermatologist.