Soaking in a warm (but not hot) bath with colloidal oatmeal for 10 minutes or longer may help soothe skin itching.
Made from finely ground oats, colloidal oatmeal doesn’t sink to the bottom of the bath. Instead, it disperses throughout the water, coating skin and temporarily relieving the itch.
Colloidal bath treatments and other oatmeal products are available at drugstores. One such example is Aveeno Soothing Bath Treatment.