I don't know how old you are, but itchy skin is also a sign of falling oestrogen levels with approaching menopause. The skin is drying out, that's why it itches.
I don't think it is any different in content to the earlier list posted by greygoose (although I've never done a line by line comparison), but I posted it just in case it looked familiar to the OP.
No change in brand. I too did wonder if it was allergy but from Grey Goode’s post I’m pretty confident it’s just one of the many hundred symptoms of hypothyroidism.
Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.
Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.