Radiation Dermatitis
A skin reaction in areas treated with radiation therapy
Quick Facts
- Type: Skin reaction to radiation therapy
- When: During and shortly after treatment
- Common signs: Redness, dryness, peeling, soreness
- Care: Gentle skin care, follow the care team
Overview
Radiation dermatitis is a skin reaction that develops in the area of the body receiving radiation therapy, most often as part of cancer treatment. Because radiation passes through the skin to reach the tissue being treated, the skin in the treatment field can become irritated and damaged over the course of therapy. The severity ranges from mild redness and dryness to peeling and soreness, and occasionally to more significant breakdown of the skin.
This reaction is a recognized and usually expected side effect of radiotherapy. Most cases are mild to moderate and improve in the weeks after treatment ends. The radiation oncology team monitors the skin closely and provides specific advice on how to care for it, which is the safest source of guidance for anyone undergoing treatment.
The likelihood and severity of the reaction depend on factors such as the total dose, the part of the body being treated, and whether other treatments such as certain chemotherapy are given at the same time. Modern radiation techniques aim to limit the dose to the skin, but some reaction is common, particularly toward the end of a course of treatment when the effects have accumulated.
Symptoms
Symptoms are limited to the treated area and tend to build up gradually during a course of radiation. They can include:
- Redness or darkening of the skin, depending on skin tone
- Dryness, itching, and flaking
- Tenderness or a burning sensation
- Peeling of the skin (dry or moist)
- Swelling and, in more severe cases, blistering or breakdown of the skin
- Long-term changes such as color change, thinning, or firmness after healing
Symptoms usually appear a couple of weeks into treatment and may continue to develop for a short time after it finishes before improving.
Causes
Radiation dermatitis is caused by the effect of ionizing radiation on the skin. Radiation damages rapidly dividing cells, including those in the outer skin layers, faster than the skin can replace them. This leads to inflammation and impaired healing in the treated area.
- The total radiation dose and how it is divided over time
- The area of the body being treated, especially skin folds and sensitive sites
- The treatment technique and equipment used
- Individual factors such as skin type and other health conditions
Risk Factors
- Higher total radiation doses
- Treatment of areas with skin folds or thin skin, such as the breast, head and neck, or groin
- Certain chemotherapy given alongside radiation
- Sun-damaged or fragile skin
- Other conditions that affect skin healing, such as diabetes
Diagnosis
Radiation dermatitis is diagnosed by the care team based on the appearance of the skin in the treatment area during or after radiotherapy. There is usually no need for tests. The team will:
- Examine the skin: Grading the reaction from mild redness to more severe breakdown.
- Track changes: Monitoring the area at each treatment visit.
- Check for infection: If the skin is broken, looking for signs that suggest infection needing treatment.
Treatment
Care focuses on soothing the skin, preventing infection, and supporting healing, always under the guidance of the radiation team.
- Gentle skin care: Washing gently with lukewarm water and a mild cleanser, and patting the skin dry.
- Moisturizers: Using creams or ointments recommended by the care team.
- Avoiding irritation: Wearing loose, soft clothing and avoiding rubbing, scratching, or extremes of temperature on the area.
- Wound care: For areas with peeling or breakdown, special dressings and topical treatments as advised.
Only use products approved by your radiation team, as some lotions, powders, or deodorants can interfere with treatment or worsen the reaction. Most skin recovers in the weeks after radiotherapy ends.
Prevention
- Follow the specific skin-care instructions from your radiation team
- Keep the treated area clean and dry, and avoid harsh soaps
- Protect the area from sun and avoid heat or cold extremes
- Wear soft, loose clothing over the treated skin
- Avoid scratching and ask before using any new creams, lotions, or deodorants
When to See a Doctor
Tell your radiation team promptly about skin changes during treatment so they can advise and adjust care. Seek medical attention if you notice:
- Open, weeping, or blistered skin in the treated area
- Signs of infection, such as spreading redness, warmth, swelling, pus, or fever
- Severe pain or skin breakdown
- Skin problems that worsen after treatment has finished
Frequently Asked Questions
When does radiation dermatitis start during treatment?
Skin changes usually begin a couple of weeks into a course of radiation, as the effects build up. The reaction may continue to develop for a short time after treatment ends before it starts to heal. Your care team monitors the skin at each visit.
How can I care for my skin during radiotherapy?
Wash gently with lukewarm water and a mild cleanser, pat dry, and use only moisturizers approved by your radiation team. Wear soft, loose clothing, avoid scratching and sun exposure, and do not apply new products to the area without asking your team first.
Does radiation dermatitis go away?
Most mild to moderate reactions heal in the weeks after radiation therapy ends. Some long-term changes, such as a difference in skin color, thinning, or firmness, can remain. Severe reactions take longer and need close follow-up by the care team.
When should I worry about a radiation skin reaction?
Contact your care team if the skin becomes open, weeping, or blistered, or if you see signs of infection such as spreading redness, warmth, swelling, pus, or fever. Severe pain or skin breakdown also needs prompt medical attention.
References
- National Cancer Institute (NCI). Radiation therapy side effects.
- American Cancer Society. Skin reactions to radiation therapy.
- DermNet. Radiation dermatitis.
- MedlinePlus, U.S. National Library of Medicine. Radiation therapy skin care.