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Well, in such cases where there is no apparent rash or allergy but still the person feels itch coming from inside of body , an anti depressant drug such as Cymbalta ( Duloxetine ) at dose of 40-60 mg/ day has been used effectively and i have good results with this drug in my clinical practice with similar cases like yours. The drug works on the premise of this itch being a psycho-somatic symptom rather than a physical symptom , in other words the itch could be psychological in origin and hence it justifies the absence of any kind of allergy and no response to topical antifungal creams and anti histaminics ( anti allergic medications ) which you must have tried many times by now.
So kindly discuss this medication with your prescribing doctor and give it a realistic try for about a month or two and see how you respond to it.
I am hopeful that you will reap benefits from its use.
Wish you all the best.
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