Thanks for posting your query.
Do you have yellow discoloration of sclera & urine/ loss of appetite/ abdominal pain?
Do you have any skin lesion apart from itching?
Is face is involved or spared?
Itching may be due to skin disease or due to systemic disease.
Your itching may or may not be related with diabetes
You should consult with dermatologist/ internal medicine specialist and should go for thorough check up.
You should take anti allergic along with steroidal ointment for relief of symptoms.
Dr. Mayank Bhargava