I’ve noticed this phenomenon before.
My scalp does not itch ordinarily. I do not suffer from dandruff or psoriasis or any other skin ailment.
But when I get a head cold and take an over-the-counter medication to relieve the symptoms, my scalp itches.
I’ve always assumed it was related to the medication drying out the mucous membranes in my sinuses.
Can anyone corroborate this or offer alternative explanations?