Cornstarch is an effective treatment for itching that is associated with dry skin due to radiation therapy but should not be applied to moist surfaces, to areas with hair, sweat glands, skin folds, or to areas close to mucosal surfaces, such as the vagina or rectum. When cornstarch becomes moist, it can promote fungal growth. Some powders such as those that contain talcum and aluminum can cause skin irritation during radiation therapy and should be avoided when you are receiving radiation treatment. Topical steroid creams may reduce itching but may cause thinning of the skin and can make it more prone to injury. Baths that are moderately warm and last no longer than one half hour every day or every two days can help relieve itching.
Frequent bathing can aggravate dry skin, and hot baths can promote itching.
Mild soaps contain less soap or detergent that can irritate skin. Oil can be added to the water at the end of a bath or applied to the skin before drying. Heat can cause itching. Your skin loses moisture when the humidity is low. A cool, humid environment may prevent your skin from itching.