I was going to suggest seasonal allergies, but since this has been ongoing for years that can't be it.
I had a very itchy baby, and I couldn't figure it out for years. Always had to keep t shirts on her bc she would scratch herself raw. Then we moved, and our new house has a soft water tank. She doesn't itch anymore. For her, the trigger was the hard water. Do you have hard or soft water at your house?
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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