Based on PubMed | Can endometrial cancer or its treatments cause a skin rash, and what items should a patient checklist include to assess it, such as onset, distribution, morphology, pruritus or pain, mucosal involvement, fever, recent medication or chemotherapy or hormone exposure, and lymphadenopathy, and which features are red flags requiring urgent evaluation?

Skin rashes can occur in people with endometrial cancer for several reasons, most commonly as side effects of treatment, but occasionally from other cancer‑related processes. Chemotherapy, immunotherapy, radiation, and certain targeted agents used in endometrial cancer can each cause characteristic skin reactions, and some warning signs indicate a need for urgent care. ^{[1] [2] [3] [4] [5] [6] [7] [8]}

How endometrial cancer treatments can cause rash

• Chemotherapy (e.g., carboplatin/paclitaxel; doxorubicin/cisplatin): These drugs often lead to red or bumpy rashes with dry, itchy skin, and sometimes peeling or blisters, especially in sun‑exposed or previously irradiated skin. ^{[1] [2] [3] [4]} Photosensitivity (sun‑sensitive rash) can mimic a bad sunburn and may blister. ^[4] In a previously irradiated area, “radiation recall” can appear as dry, red, itchy, tender, swollen skin that may peel or blister weeks to months after chemotherapy. ^{[5] [9]}

• Immunotherapy (e.g., dostarlimab, nivolumab, durvalumab): Immune checkpoint inhibitors frequently cause immune‑related skin rashes that may be red, itchy, and sometimes blister, and in rare cases can evolve into serious reactions. ^{[3] [10]} There are reports of psoriasis and palmoplantar pustules with joint pain after dostarlimab for endometrial cancer. ^[7]

• Targeted therapy and combinations: Radiation recall dermatitis has been described during pembrolizumab plus lenvatinib for endometrial cancer, resolving when the targeted agent was paused. ^[6]

• Radiation therapy: Within the treatment field, skin may become red, dry, itchy, and can blister; any blisters or new rash should be reported because they can signal infection. ^[8]

• Hormone therapy: While hormone therapy for endometrial cancer mainly causes menopausal‑type symptoms, skin rashes are less typical but can still occur and should be assessed like other drug rashes. ^{[11] [12]}

• Other cancer‑related causes: Rarely, paraneoplastic skin syndromes (e.g., acanthosis nigricans, tripe palms, acquired hypertrichosis lanuginosa) or even cutaneous metastases may appear in association with endometrial cancer and can signal progression. ^[13] Acquired hypertrichosis lanuginosa has been reported with endometrial malignancy and resolved after treatment in a classic case. ^[14]

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Practical patient checklist for any new rash

Use this checklist to organize information before contacting your care team. Bringing clear details helps clinicians quickly decide the next steps and identify red flags. ^{[1] [8]}

1. Onset and timing

• Date and time the rash started; whether it coincided with a new drug, infusion day, radiation, or sun exposure. Most drug rashes start within the first 1–2 weeks of a new medication, but immune‑related rashes can appear later. ^{[1] [3] [4] [5] [9]}

2. Distribution and spread

• Body areas involved (face, chest, back, arms, legs, hands/feet, scalp, skin folds, within radiation field).
• Whether it is localized versus widespread and if it is worse in sun‑exposed areas or previously irradiated skin (think photosensitivity or radiation recall). ^{[4] [5] [9]}

3. Morphology (what it looks like)

• Color (red, purple, dusky), texture (bumpy, flat), and features (scaling, dryness, hives, acne‑like bumps, blisters, peeling).
• Note any ulcers, open skin, or pus. ^{[2] [3] [4] [8]}

4. Symptoms

• Itch (pruritus), pain, burning, or tenderness, and whether over‑the‑counter moisturizers or antihistamines helped. ^{[2] [3] [4]}

5. Mucosal involvement

• Sores in the mouth, eyes, genitals, or painful swallowing these can signal serious reactions. ^[10]

6. Systemic symptoms

• Fever, chills, malaise, sore throat, cough, sore eyes, or new fatigue. ^[10]

7. Medication and treatment exposure

• List all recent and current treatments (chemotherapy, immunotherapy like dostarlimab/nivolumab/durvalumab, targeted therapies like lenvatinib, radiation dates, hormone therapy), plus antibiotics, pain meds, supplements.
• Note first and most recent doses, and any dose changes around onset. ^{[1] [3] [6] [7]}

8. Lymph nodes and swelling

• New facial or hand swelling, or tender/enlarged lymph nodes, which may accompany some drug reactions. ^{[10] [2]}

9. Triggers and care tried

• Sun exposure, new skincare or detergents, recent infections.
• Moisturizers, topical steroids, antihistamines, and how the skin responded. Gentle, fragrance‑free moisturizers and sun protection are reasonable first steps for mild rashes. ^{[2] [3] [4]}

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Red flag features that need urgent evaluation

Seek same‑day medical attention (or emergency care if severe) if any of the following occur. These can signal serious drug reactions or infections that require prompt treatment. ^{[1] [8] [10]}

• Rash with fever, with or without feeling unwell (aches, fatigue, sore eyes, cough, sore throat). ^[10]
• Blistering or skin peeling, painful skin, or open sores/ulcers. ^{[2] [3] [8]}
• Mucosal involvement (mouth ulcers, eye redness/pain, genital sores) or painful swallowing. ^[10]
• Facial swelling, trouble breathing, wheezing, dizziness, or rapid onset hives signs of an allergic reaction during infusion or shortly after. ^[1]
• Rash in a previously irradiated area that is rapidly worsening (possible radiation recall) or becoming very painful or swollen. ^{[5] [9]}
• Signs of skin infection at rash sites (worsening redness, warmth, pus, increased pain). ^[2]
• New widespread rash that is rapidly spreading or associated with swollen lymph nodes and malaise (consider severe drug eruptions). ^[10]

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At‑home care for mild rashes (while you notify your team)

• Moisturize frequently with gentle, fragrance‑free creams and avoid scratching. ^{[2] [3]}
• Sun protection: cover up, use SPF 50+ sunscreen, avoid midday sun to reduce photosensitive flares. ^[4]
• Gentle skin hygiene: mild soap, lukewarm water, avoid hot showers; avoid tight clothing on affected areas. ^[8]
• Contact your oncology team early for guidance, especially before starting any new topical or oral medicines. They can tailor treatment (e.g., topical steroids, antihistamines) and decide if drug holds are needed. ^{[2] [3] [1]}

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Key takeaways

• Yes rashes are common during endometrial cancer treatment, particularly with chemotherapy, immunotherapy, and in previously irradiated skin, and they range from mild dryness and itch to blistering reactions. ^{[2] [3] [4] [1] [5] [9]}
• Immune therapies like dostarlimab can cause diverse immune‑related skin reactions, and rare psoriasis‑like eruptions have been reported. ^[7]
• Radiation recall dermatitis can appear in old radiation fields when certain systemic treatments (including lenvatinib with pembrolizumab) are started. ^[6]
• Track onset, spread, look, symptoms, mucosal involvement, fever, recent treatments, and lymph nodes, and report promptly especially if any red flags are present. ^{[1] [8] [10] [2] [3] [4] [5] [9]}

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Table: Quick rash assessment and red flags

• Item to assess: Onset relative to drugs/radiation/sun; What to note: exact start date, first/last dose, dose changes; Why it matters: links rash to a culprit or photosensitivity. ^{[1] [4]}
• Distribution: localized vs widespread; within radiation field; sun‑exposed areas; Helps identify drug eruption, radiation recall, photosensitivity. ^{[5] [9] [4]}
• Morphology: red/bumpy, dry, itchy, blisters, peeling, ulcers; Blisters/peeling/ulcers raise concern for severe reactions. ^{[2] [3] [8]}
• Symptoms: itch, pain, burning; Painful skin can indicate severe dermatitis. ^{[2] [3]}
• Mucosa: mouth/eye/genital sores; Suggests severe drug reactions needing urgent care. ^[10]
• Systemic: fever, malaise, sore eyes, cough, sore throat; Viral‑like prodrome can precede serious rash. ^[10]
• Lymph nodes/swelling: facial/hand swelling, tender nodes; May accompany significant eruptions. ^[10]
• Red flags (urgent): fever plus rash; blisters/peeling; mucosal sores; breathing issues; rapidly worsening radiation‑field rash; signs of infection. ^{[1] [8] [10] [2] [3] [5] [9]}