A few things can cause you to itch with no visible rash:
Hepatitus C-Almost 2% of the population of the United States is infected with Hepatitis C. Not everyone who carries the virus is sick.
Anxiety- Sometimes itching and scrathing become an anxiety and stress release
Nerve problems- As someone else mentioned, you could have a slight pinch or pressure point on a nerve.
Lymphoma/Hodgkins disease-Lymphomas are tumors arising within or made up of cells from the lymphatic system. Both types of lymphoma are usually discovered by noticing enlargment of some lymph nodes. Symptoms are usually not present, although a minority of people with these conditions will have unexplained fever, weight loss, or severe unexplained itching.
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