I hear you & thank you for writing into HCM!
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you described...how long exactly has it been on for?
Are you allergic to any particular food products eg wheat products?
Is there anyone else with a similar itch? Does it get worse at nights?
Please do ingest an antihistamine in the interim..fexofenadine
180mg is a good bet.
Do visit a dermatologist
nearest you. This looks like a skin biopsy
is in order to clinch the diagnosis preferably one employing a lab with immunoflorescent techniques
Good LUck& God Bless!
Dr Praveen Rodrigues MD