The itchy skin may be a symptom of something else, so try to find out what is causing the symptoms.
For instance there is a liver disease that causes itchy skin symptoms, or some form of allergy or intolerance. Lactose intolerance gives rise to itchy skin symptoms.
Just treating the symptom without trying to determine the underlying cause is just a short term palliative solution.
Consult your doctor or dermatologist (assuming of course that you have not already done so).