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I understand your concern.
For symptomatic treatment of itching you can apply calamine lotion.
Also you can discuss with your doctor about long acting anti histamine like Allegra.(fexofenadine)
I hope this helps
Paraneoplastic pruritus is where itching occurs in association with cancer. The mechanisms in paraneoplastic pruritus are complex and are not fully understood.
Itching in paraneoplastic pruritus is usually generalised (all over the body) without any obvious rash.
The line of treatment may include