Are there any treatments or medications that can relieve itchy skin?

My mother has been suffering from itchy skin for several years now, to the point where she can't even sleep at night.

Maybe it's because my skin is dry, but dead skin cells are falling off my body.

If you comb the living room, white powder may come out.

Since you are old, you may not be able to bathe often.

I think it's because my skin is getting drier.

Fortunately, I felt a little better after applying the Livihill body cream.

Maybe it's because it's winter, but my skin is getting itchier.

You may scratch yourself while sleeping and get bruises on your body, and you may not be able to sleep well because it is so itchy.

Can I get a treatment or medication prescribed by a dermatologist to improve this itchy skin?

Or is this itching not due to a problem with the skin itself, but due to another problem...

Does anyone have experience treating itchy skin in their parents?