This used to happen to me all the time, but particularly where fabric rubbed against my skin. I mentioned it to a doctor once, because at times it would make exercising unbearable, and he said it's a slight allergic thing akin to hayfever, even if you have no other hayfever symptoms. Taking an antihystamine (like claratyne) once a day, or once every few days, should work. For me it worked 100%! If I dont take one for a few days the itching comes back.
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