There are many reasons for the skin to become sensitive during therapy. This can relate to radiotherapy to the area, or the use of some medications (i.e. antifungals, chemotherapy and antibiotics).
If you are receiving radiation the radiation oncology specialist will give you an approach to managing the skin sensitivity that comes from radiotherapy.
During any type of cancer therapy, it is recommended that all patients comply with sunsmart habits including wearing protective clothing (long sleeves and pants), hats and 30-50+ SPF sunscreen when out in the sun. These measures will help to avoid further skin damage that can result from the medicines used in your therapy.