Itching for 6 months

My hubby had itching all over his body,fa the past few months..when we consulted a famous dermatologist here,he said its form of allergy(ovvamai in tamil) and prescribed Xyzal-m husband has been taking that tablet regularly..if he misses a day to take it,the itching is back..he has also developed white fish scale like patches in his legs..(in a small proportion).what should we do now?how long should we keep using the tablet?pls suggest a good dermatologist in chennai..(blood tests were found to be normal and no food allergies)what are these scales like patches?white scale comes out when that area is scratched..pls help us out..
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Dr. C.R.V.Narasimhalu
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Undergo skin prick test... To identify the allergen.
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