Skin reactions from radiation therapy

What changes to the skin can I expect from radiation therapy?

Skin reactions caused by radiation therapy are also known as radiation dermatitis, and occur to some degree in most patients undergoing radiation therapy. Skin changes from radiation therapy will only occur in the area that is being treated. Whether you may experience skin changes will depend on:

  • The area that is being treated
  • How much radiation therapy you are receiving and how it is being given
  • Any other treatments or medications that you may be taking
  • Your age and overall health

Changes can include:

  • A change in skin colour (from slight pink to red)
  • Itching
  • Dryness or peeling
  • Irritation
  • Blistering, weeping
  • Pain or swelling

Unlike other reactions such as allergic reactions, skin reactions from radiation therapy begin slowly and predictably. This means that if you should experience a radiation-induced skin reaction, you will have time to talk to your treatment team and to receive the advice and assistance that you need to manage it.

The skin in the area being treated may become red and irritated and may look and feel something similar to a burn injury.  While it may look and feel like a burn injury, it is important to know radiation therapy does not actually burn the skin, and it is not the same as a burn from a hot object.

Your treatment team will show you how to care for your skin and manage any skin reactions. It is important to always ask your treatment team about any side affects you might be experiencing before applying any creams or other remedies. Tell your treatment team if you’re worried about a skin reaction or are experiencing any skin changes.

How long will skin reactions last?

Seven to ten days after your treatment begins, you may begin to experience skin reactions in the area of your body that is being treated.

If your skin is affected, this reaction will last until the end of your radiation therapy treatment and will even continue to develop after treatment has finished. The reaction can become more intense towards the end of treatment and increase for up to two weeks after treatment finishes.  Your skin usually returns to normal around four to six weeks after treatment finishes.

How can I manage my skin during radiation therapy treatment?

You should keep the skin in your treatment area clean and protected from the sun, irritation, friction and excessive temperatures during radiation therapy and for two to four weeks after radiation therapy.

You should also avoid the use of perfumed products, sunscreen, talcum powder, products containing alcohol or the use of adhesive dressings in the treatment area. If a dressing is required, your treatment team will provide advice about the most appropriate dressing for you. Shaving of the affected skin area should be with an electric razor only.

Moisturise at least twice a day

Your treatment team will recommend a cream to help manage any skin changes. At the start of your treatment, apply cream to the area being treated twice a day. As treatment progresses, you may need to apply the cream three to four times per day.

  • Do not apply cream within the hour prior to your treatment, as cream needs to be well absorbed.
  • Please advise your treatment team if your skin becomes broken or has moist areas.

Wear loose fitting clothing

Avoid wearing tight fitting clothing that could potentially rub or irritate the skin in the area that is being treated. You may find singlets, cotton ‘crop-tops’ or loose-fitting bras and underwear more comfortable. Avoid underwire or lace bras.

Avoid excessive temperatures

Avoid exposing the treatment area to excessive temperature including direct sunlight, very hot showers or baths, heat packs, ice packs, saunas or hot spas during the course of your radiation therapy.

Wash with warm water and pat dry

You may wash the area of skin that is being treated with warm water and a mild non-perfumed soap. Pat dry the skin using a soft towel – do not rub. Use an electric razor if shaving in the area is necessary.

Washing and styling your hair

If you are receiving radiation therapy to the scalp area or to the brain, avoid frequently shampooing your hair. You may wash your hair with warm water and a mild, non-perfumed shampoo. Let your hair dry naturally. Avoid hair dryers, curling irons and straighteners. Continue this for two weeks after completing treatment or until there are no signs of irritation. Avoid using hairsprays, gels or styling products. Do not colour or perm your hair until four weeks after your treatment is complete.

Protect the treatment area from the sun

When outdoors, wear loose fitting protective clothing to protect the treatment area from the sun. If the treatment area is the head or neck, wear a wide brimmed soft hat at all times when outdoors. Avoid applying sunscreen to the treatment area during treatment.

Skin care products to avoid during radiation therapy

You should avoid applying the following products to your skin in the treatment area during radiation therapy treatment:

  • Alcohol
  • Perfumes
  • Products containing alpha-hydroxy acids
  • Creams and dressing containing metals
  • Sunscreen
  • Cornstarch
  • Baby powder/talcum powder

If you are unsure about which products to use on your skin during and after radiation therapy treatment, please check with your treatment team.

Frequently asked questions

How common are radiation-induced skin reactions?

Skin changes may be experienced by up to 95% of patients who receive radiation therapy treatment. 1

There are a number of different factors which may increase how likely a person is to experience skin reactions from radiation therapy and how severe the reaction might be including: 2

  • The dose of the radiation and the total treatment time
  • The location and size of the area being treated
  • The general health of the person
  • Whether the person has other existing conditions, for example diabetes
Are radiation-induced skin reactions the same as a burn injury?

Skin reactions from radiation therapy treatment are not the same as a burn injury from a hot object or other causes of trauma such as fire, freezing object, corrosive substance, electric current etc.

This is why the term ‘radiation burn’ is actually a misnomer.

Other differences are:

  • Injury from a burn is immediate while radiation-induced skin reactions take around 7-10 days to develop
  • Injury from a burn can potentially affect all the layers of the skin down to the muscle and bone while radiation-induced skin reactions affect the epidermal layer of the skin only
  • Injury from a burn travels downwards through the skin layers depending on the degree of the burn while a skin reaction from a radiation therapy travels upwards towards the surface of the skin
Why does radiation therapy cause skin reactions?

Radiation therapy works by damaging the DNA inside cancer cells. These breaks interfere with the way that the cancer cells grow and divide causing them to die.

When you receive radiation therapy, the radiation beam must pass through the skin in the area that is being treated. This causes damage to the cells in the basal layer of the epidermis of the skin.

Fortunately, healthy cells can regenerate, whereas cancer cells are mutated cells and once they are destroyed by radiation, they cannot recover.

The damaged skin cells move upwards from the basal layer taking around 7-10 days after the first dose of radiation therapy which is why skin changes such as redness usually occur after this time.


To view the full list of references, click here.
  1. Porock, D. 2002. “Factors influencing the severity of radiation skin and oral mucosal reactions: development of a conceptual framework.” Eur J Cancer Care (Engl) 11(1):33-43.
  2. EviQ. (2018). Management of radiation induced skin reactions. Retrieved on 5 August 2020 from
  3. EviQ. (2014). GP fact sheet – common radiation therapy side effects. Retrieved on 5 August 2020 from
  4. EviQ. (2015). Skin changes and skin care during radiotherapy. Retrieved on 5 August 2020 from
  5. EviQ. (2018). Management of radiation induced skin reactions. Retrieved on 5 August 2020 from
  6. OncoLink. (2018). Skin Reactions From Radiation. Retrieved on 5 August 2020 from
  7. American Cancer Society. (2019). Radiation Therapy Side Effects. Retrieved on 5 August 2020 from,is%20sometimes%20called%20radiation%20dermatitis.
  8. St Jame’s Institute of Oncology. (2011). Managing Radiotherapy Induced Skin Reactions: A Toolkit for Healthcare Professionals. Retrieved on 5 August 2020 from
  9. Cancer Management and Research 2019:11 167–177 Jinlong Wei1 Lingbin Meng2 Xue Hou1 Chao Qu1 Bin Wang1 Ying Xin3 Xin Jiang1 1 Department of Radiation Oncology, The First Hospital of Jilin University, Changchun 130021, China; 2 Department of Internal Medicine, Florida Hospital, Orlando, FL 32803, USA; 3 Key Laboratory of Pathobiology, Ministry of Education, Jilin University, Changchun 130021, China
  10. EdCaN. (2020). Radiation skin reactions. Retrieved on 5 August 2020 from

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