For a while I've had mysteriously itchy skin which seems triggered by hot showers, temperature changes, and time-of-day. I was told antihistamine tablets (sold over-the-counter for hay-fever) can help, but I have haven't tried it yet.
(Another common cause of itchy skin is being too dry => apply moisturizing lotion twice daily. It doesn't sound like what you have, but I guess you could try).
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