A lot of patients in the process of radiation therapy, may find that the body painted body marking line always fall off, especially in the summer time, because of bathing or sweating more, the body marking line will fall off. Encounter such a problem what to do: first, summer bath time try to avoid rubbing the body surface of the iconic parts, avoid using soap, shower gel and other toiletries on the body surface of the iconic line rubbing. Second, if you find that the radiotherapy line is not clear, you need to respond to the radiotherapy technician in a timely manner, and use a marker pen to re-trace clearly, so as to avoid the problem of the body surface marking line always fall off.