أحسن الله إليكم شيخنا Can I use oils and certain creams not for tazayyun, but because my skin is itchy and dry and this causes discomfort? Or is this tashabbuh with nisā'?

Treating dry and itchy skin is treatment, not adornment, and the tashabbuh that is forbidden is a man resembling women in what is particular to them. A cream or an oil used to relieve discomfort is not that.