SKIN REACTIONS Skin reactions occur during radiation therapy because of changes in the layers of the skin and sweat glands. Several factors can influence the degree of skin reactions you might experience, such as the area of treatment, the daily dosage and/or total dosage, the type of radiation being used, if you are using chemotherapy drugs, and your overall nutritional status. Each patient is different, and individual reactions vary. Acute skin reactions may occur two to three weeks after radiation therapy starts and usually subside approximately one month after treatment is completed. You may notice redness, dryness, hair loss and itching in the area being treated. You may also experience moist areas if there is a fold of skin in the treated area or in areas where skin rubs directly on skin. These areas may feel sore. Your physician, therapist and nurse will be checking the area and will advise you how to manage skin reactions. Later skin reactions may occur six or more months after radiation therapy. You may notice the skin as darker and/or shinier in color in the area of treatment. It is important to take proper care of your skin in the area being treated with radiation therapy. Avoid irritating the treated skin. Wash with lukewarm water and mild soap; pat dry. Do not wear tight clothing over the area. Do not rub, scrub or scratch the skin in the treated area. Avoid putting anything that is hot or cold, such as heating pads or ice packs, on the treated skin. Do not use creams, perfumes, deodorants, body oils, ointments, lotions or home remedies on the treated area unless approved by your doctor, nurse or therapist. Avoid exposing the radiated area to the sun during treatment. Wear protective clothing to cover the treated area, such as a hat or long sleeves, when out in the sun. Ask your doctor about using sun-blocking lotions. Baby powder and cornstarch may be applied to intact skin in the treated area; however, if the area feels moist and the skin is broken, do not use cornstarch or powder because it may cake up and promote bacteria and fungal growth. Your physician, therapist, or nurse will give you instructions how to care for this area. Proper nutrition is important to help in tissue healing so it is important to eat a well balanced diet. Return To Commonly Asked Questions