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Why do they put those marks on my skin for my radiation therapy?

ANSWER

These marks provide points to aim the treatment machine at and form a semi-permanent outline of your treatment area. Do not try to wash these marks off or retouch them if they fade. The therapist will re-mark the treatment area when necessary.

From: Prostate Cancer: Radiation Therapy WebMD Medical Reference

SOURCES: 

American Cancer Society.

American Urological Association.

FDA.

Reviewed by Jennifer Robinson on October 22, 2017

SOURCES: 

American Cancer Society.

American Urological Association.

FDA.

Reviewed by Jennifer Robinson on October 22, 2017

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Can diet help with the side effects from radiation therapy for skin cancer?

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