It is possible that the Puricos (which contains Allopurinol; a drug designed to control Gout) may be causing the itching. Why not stop the Puricos and ask your GP to try Colchicine instead. Itching without a rash is likely to be due to very dry skin or a detergent in soap or shampoo irritating the skin. You could try using a good moisturising emollient such as Epazote E or Epimax.
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