An itch--chronic itching-- without a rash has a wide differential, and it is important that you know it, and that your doctor investigates accordingly.
Iron deficiency [and this can be from slow bleeding], polycythemia vera, liver or kidney problems, heavy metals, allergy, parasites, hidden infection and hidden cancer.
In addition more rarely, other autoimmune disease, hormonal disease, and other toxins that heavy metals.
This is not something just to treat, and your skin can be in perfect condition. Go over this list with your doctor without fail.
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