Mainly caused by dry skin.
The water temperature in the bath is also an important factor for itchy skin after bathing. Generally, the water temperature in the bath is about 38 degrees. Don't be too high, it will wash off the oil on the body, make the skin drier and itch more easily.
And don't use soap to take a bath. Soap has a strong deoiling effect, which will make the skin drier.
You should choose a moisturizing shower gel to use. I think Johnson & Johnson's milk shower gel is still moisturizing.
Be sure to wear lotion after taking a shower.
I think glycerin is easy to use, not greasy, and the moisturizing effect is quite good.
I hope it works for you