Tattoos for Breast Radiation Therapy

These markings are done to help guide treatment

Before having breast radiation, you may need to have skin markings or radiation tattoos put on your breast skin. These marks help your radiation therapist aim the radiation precisely where it's needed. You may receive radiation five days a week for four to five weeks, and every treatment must be aimed at the same place in order to prevent recurrence and to spare healthy tissue.

radiation tattoo
Verywell / Jessica Olah

Size and Appearance

Your breast radiation tattoos will be tiny—about the size of a freckle, or one millimeter in diameter. There will often be four tattooed dots, each marking one corner of the area to be radiated, but some radiation centers are now only doing one or two. Radiation tattoos are often in regions that won't be seen by others.

They are blue or black and created using a drop of ink and a very slender needle. These tattoos won't wash off, so you will be able to shower or swim anytime during treatment without losing these important markings. 

Radiation tattoos will be created during your treatment simulation before actual treatments begin.

What It Feels Like

You may feel the needle stick, but it shouldn't hurt any more than a mosquito bite. Many women say that it hurts less than a blood draw or the insertion of an intravenous needle for chemotherapy.


Most radiation tattoos will be permanent, though some radiation therapists use temporary versions. While some women may prefer a reversible method such as this, these marks have to be kept dry until the end of therapy. In other words, if temporary markers become wet, you could risk your radiation therapy being inaccurate.

Side Effects

There are very few side effects related to the use of tattoos for breast cancer radiotherapy. In extremely rare cases, people have had allergic reactions to the dye.


Studies are in progress looking at an alternative to visible tattoos for radiation therapy. One study found that women who had invisible tattoos applied (using fluorescent dye) had improved body image six months after treatment compared to those who had conventional tattoos.

Removal Options

If your chances of recurrence are very low and your oncologist agrees, you may wish to consider having your tattoos removed. Options include surgery, dermabrasion, and cryotherapy. A dermatologist should be able to guide you on the best method to use.

A Word From Verywell

Coping with radiation tattoos is easier if you understand their purpose and importance. Many women see their radiation tattoos as marks of survival and strength, rather than something they want to have removed. You may even decide to turn your tattoos into a creative design to celebrate your survival.

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  1. Landeg SJ, Kirby AM, Lee SF, et al. A Randomized Control Trial Evaluating Fluorescent Ink Versus Dark Ink Tattoos for Breast RadiotherapyBr J Radiol. 2016;89(1068):20160288. doi:10.1259/bjr.20160288

  2. Rathod S, Munshi A, Agarwal J. Skin markings methods and guidelines: A reality in image guidance radiotherapy era. South Asian J Cancer. 2012;1(1):27-29. doi:10.4103/2278-330X.96502