Radiodermatitis is an inflammatory skin reaction caused by the ionizing radiation used in radiation therapy—it affects 80 to 95 percent of patients undergoing treatment. The WHO classification distinguishes four grades:
The areas most at risk are skin folds (armpits, groin, under the breasts) and areas of thin skin (face, neck). Actinic keratosis (a precancerous sun-induced lesion) shares histological similarities with certain forms of chronic radiodermatitis—both result from exposure to ionizing radiation.
Prevention is better than treatment. The recommendations of the AFSOS (Francophone Association for Supportive Oncology Care) advise the following starting on the first day of radiation therapy: gentle daily cleansing with a superfatted soap or fragrance-free dermatological bar (pH 5.5) and twice-daily application of a high-tolerance emollient cream (free of aluminum, retinol, and acids) to the irradiated area. The following are strictly contraindicated: aluminum-containing deodorants, fragrances, acidic creams (AHA, BHA, vitamin C), mechanical shaving, and UV exposure. Skincare products for reactive and hyperreactive skin serve as the gold standard—high-tolerance products for sensitive skin are best suited for irradiated skin.
Niaouli essential oil (Melaleuca quinquenervia, viridiflorol + 1,8-cineole) is the most extensively studied essential oil for the prevention and treatment of radiation dermatitis—its use is recommended in several French radiation therapy centers. Its viridiflorol stimulates the proliferation of fibroblasts destroyed by radiation, reduces inflammation, and promotes epithelial regeneration. It is applied diluted to 5–10% in calophyllum (tamanu) vegetable oil (Phytosun Aroms Bio)—which itself has a documented anti-inflammatory and local wound-healing effect on burns. The standard protocol: apply the niaouli + calophyllum mixture 2 to 3 times a day to the irradiated area, avoiding the 2 hours before and after the treatment session.Skin allergies to niaouli are rare but possible—a preliminary patch test on a small area is recommended.
Homeopathy complements topical treatments in the comprehensive management of radiation dermatitis. Belladonna (homeopathic dose) is the go-to remedy for intense erythema with a burning sensation and bright red skin—corresponding to grades 1–2 of acute radiation dermatitis. Germanium metallicum (4CH to 30CH) is prescribed in an oncology setting for its immune-supporting and detoxifying effects during courses of combined chemotherapy and radiation therapy. Monazite 8DH (30 Boiron oral ampoules) is a homeopathic treatment historically used for protection against ionizing radiation and the prevention of skin-related side effects. In the event of a herpes reactivation (shingles) on an irradiated area (possible in cases of immunosuppression), specific antiviral treatment is mandatory—homeopathy alone is not sufficient.
Daily care follows a strict protocol: cleansing with lukewarm water and a fragrance-free, alcohol-free ultra-moisturizing soap, gently patting dry without rubbing, and drying by patting. Moisturizing: a hypoallergenic, high-tolerance emollient cream, applied twice daily, outside of treatment sessions. Topical hyaluronic acid is particularly well-suited for irradiated skin—it maintains deep skin hydration and stimulates collagen synthesis without causing irritation. For grades 2–3 with weeping desquamation, non-adherent dressings or hydrocolloid dressings may be used as prescribed by a doctor. Sun protection (SPF 50+, mineral-based formula, alcohol-free) of the irradiated area is mandatory for 12 months after the end of treatment.
An emergency consultation with the radiation oncology team is required as soon as the following signs appear: extensive confluent weeping desquamation (Grade 3), severe pain not controlled by standard pain relievers, signs of infection (pus, foul odor, fever > 38.5 °C), visible skin necrosis or ulceration (grade 4), or an allergic reaction to niaouli or calophyllum. Topicalhyaluronic acid may be used as first-line treatment to alleviate discomfort associated with grades 1–2 while awaiting consultation—its non-irritating and non-allergenic profile makes it safe for all types of radiodermatitis. The radiation oncologist may decide to temporarily interrupt radiation therapy in cases of severe radiation dermatitis (grade 3–4)—a decision that rests solely with the medical team.
