Radiation Dermatitis in Breast Cancer Patients Undergoing Radiotherapy - An Overview

What Is Radiation Dermatitis in Breast Cancer Patients?

Radiation dermatitis is a skin reaction that is seen in people with breast cancer who are receiving radiation therapy. When we use radiation to treat cancer, it affects the healthy skin in the treated area, especially in the breast, chest wall, or underarm.

You can think of radiation dermatitis as a slow, gradual sunburn. Over the course of treatment, the skin on your breast or chest area becomes red, dry, warm to the touch, itchy, or darker in color.

Some people also notice peeling or tenderness, and in a few cases, the skin becomes sore or moist, especially in skin folds.

This reaction usually does not show up right away. Instead, it occurs after a few weeks of radiation therapy, as the skin’s ability to repair itself slows down.

The severity varies from one person to another depending on factors such as radiation dose, skin type, and sensitivity to radiation.

But the good news is that radiation dermatitis is very common, often temporary, and expected. In most people with breast cancer, the skin starts to heal within weeks after radiation treatment ends, with gradual improvement over time.

How Is Radiation Dermatitis Caused in Breast Cancer Patients?

Radiation dermatitis happens because the radiation used to treat cancer passes through your skin to reach your tumor, and in the process, it irritates and damages healthy skin cells.

When doctors give you external beam radiation therapy, the treatment itself is not painful. However, as the radiation enters your body, it damages the DNA inside skin cells, making it harder for them to repair and renew themselves.

Your skin normally replaces old cells quickly, but radiation slows this process. As a result, the skin barrier weakens, which is why your skin becomes red, sore, itchy, or dry or starts peeling, much like a burn.

Radiation also affects deeper parts of the skin. Hair follicles and oil glands are very sensitive, so you might notice hair loss in the treated area and increased dryness. The tiny blood vessels in the skin also get injured, which slows healing and increases irritation.

At the same time, radiation triggers inflammation. Your body releases chemicals that bring immune cells to the area, causing redness, swelling, discomfort, and warmth.

Radiation dermatitis happens to anyone but is most common in patients receiving treatment for breast cancer, especially because a large area of skin is treated. Your risk is higher if you have a habit of smoking, have had frequent sunburns, or are receiving radiation along with chemotherapy.

What Are the Signs and Symptoms of Radiation Dermatitis?

When discussing the signs and symptoms of radiation dermatitis, the skin changes generally do not occur all at once. They develop slowly as radiation treatment continues.

• Redness: The earliest sign is mild skin redness, sometimes appearing within hours after a radiation session. However, this early redness is often faint and temporary.

The more common skin reaction usually starts about 10 to 14 days after treatment begins and slowly worsens as treatment goes on.

• Sunburn: At first, your skin may look and feel like a sunburn. You might notice redness (or darkening if you have darker skin), warmth, swelling, dryness, itching, burning, or pain. The skin becomes darker in color, especially around the nipple and areola, usually a few weeks into treatment.

• Hair Loss: You will notice hair loss in the treated area if hair follicles are present.

• Peeling: As radiation doses increase, the skin may start to peel. It is seen as dry peeling, where the skin flakes and feels rough, or moist peeling, which is more uncomfortable. Moist peeling causes open sores called weeping areas.

It is commonly found in skin folds under the breast or in the armpit. These symptoms often peak one to two weeks after radiation ends.

How Is Radiation Dermatitis Diagnosed?

Radiation dermatitis is usually diagnosed based on the appearance of the skin and your treatment history. Special tests are rarely needed.

During radiation therapy or follow-up visits, the skin in the treated area is examined for changes such as darkening, redness, peeling, dryness, swelling, or open sores. During the examination, your doctor also asks you about itching, pain, burning, or tenderness.

The timing of symptoms is also noted. Radiation dermatitis develops slowly or after the radiation ends, which helps confirm the diagnosis.

In most cases, no blood tests, scans, or biopsies are needed. However, if the skin reaction appears unusual or shows no signs of infection, further tests are performed to rule out other causes.

How to Manage Radiation Dermatitis in Breast Cancer Patients?

Treatment Options: Managing radiation dermatitis during breast cancer treatment focuses on relieving symptoms and protecting the skin. It involves:

• Topical creams, such as unscented moisturizers that do not contain Lanolin, can ease dryness and itching. For more severe reactions, your doctor will prescribe steroid creams to reduce inflammation and prevent further skin damage.

• Your doctor will advise you to use mild soap and lukewarm water to wash, avoid scrubbing, and pat the skin dry.

• To help you relieve the pain, over-the-counter medications can be used.

• For areas that are peeling or moist, sterile dressings help protect the skin and reduce the risk of infection.

Prognosis:

• Most skin reactions improve within a few weeks after finishing radiation therapy, though the skin may remain sensitive for up to a month.

• Complete healing of the skin may take longer, but severe long-term problems are uncommon.

• It is recommended that you be gentle with your skin, follow your doctor’s instructions, and report any discomfort to make your recovery easier.

Prevention:

• Radiation dermatitis cannot be prevented completely, but steps can be taken to reduce the risk or severity.

• You should protect your skin by avoiding sun exposure, and wearing loose, soft clothing can be helpful.

• When using skincare products or a skincare routine, you must follow your doctor’s advice, monitor skin changes, and report any changes to your doctor right away.

Conclusion:

Radiation dermatitis remains one of the most common and impactful side effects of radiotherapy in breast cancer patients.

Despite major advancements in radiation techniques that better protect the normal tissue, skin reactions still occur due to the unavoidable exposure of the skin to ionizing radiation.

These reactions range from mild redness and itching to more severe peeling, ulceration, and long-term skin changes, affecting both the patient's appearance and confidence.

If you are undergoing radiotherapy and notice some skin changes, talk to a specialist in cancer and radiation who can help you go through this phase of your treatment.

Key Takeaways:

1. Radiation dermatitis is a frequent and expected skin side effect of breast cancer radiotherapy.

2. It occurs due to radiation-induced DNA damage to the skin cells, especially basal keratinocytes.

3. Radiotherapy is used in approximately 45 percent of breast cancer cases, making radiation dermatitis a common concern.