Well, your circulation and sensation need to be checked by your doctor. Need to have some blood work like CBC, and blood sugar level. Scrapping may be done to test fungus infection. Local cortisone cream, calamine lotion , oat meal, and oral antihistamine will help to stop itching and stop vicious cycle. Also try dairy free and gluten free diet ,or even better paleo diet for two weeks. If it helps then keep it for longer.
If you are not better in two weeks you should see internist or dermatologist
to have more testes done and to make sure any systemic disease is not missed.
Dr. Tahir. MD
Internal Medicine- Family Medicine in Rochester and Syracuse ( Holistic, Natural and Integrative Approach)