Medical Oncologist
Skin side effects
Skin Darkening, Depigmentation and — Pigment Changes
Colour changes in your skin are one of the most common cosmetic effects of cancer treatment. Most are harmless and fade after treatment ends. Blistering, burning pain, or any skin change with fever is different — that needs a same-day call.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- Usually cosmetic — Skin darkening or lightening from chemotherapy and immunotherapy is almost always a cosmetic effect, not a sign that treatment is failing or the cancer is worsening.
- Several treatments cause it — Chemotherapy, targeted therapy, immunotherapy and radiation all affect skin pigmentation differently, so the change you see depends on what you are taking.
- Sun sensitivity increases — Treated skin is more sensitive to sunlight. Using SPF and covering up reduces discomfort and prevents colour changes from deepening further.
- Know when to call — Blistering, burning pain, or any skin change with fever is not a cosmetic effect — it needs a same-day call to your team.
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Skin darkening or colour change is one of the most common cosmetic effects of chemotherapy, targeted therapy and immunotherapy. It is usually not dangerous. Blistering, skin that is peeling or painful to touch, a rash that spreads rapidly, or any skin change with fever needs a same-day call — those are not ordinary pigment changes.
If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.
What can you do at home for ordinary pigment change?
Ordinary skin darkening or lightening during cancer treatment does not need medical treatment. A few simple steps reduce discomfort and prevent the colour from deepening.
Protect affected skin from sunlight every day. Use a broad-spectrum SPF, wear full-sleeved clothing when outdoors, and avoid the midday sun. Treated skin is more sensitive to UV light, which can make pigment changes more pronounced and slower to reverse after treatment ends.
Keep your skin moisturised with a fragrance-free lotion and use gentle, non-abrasive soaps. Do not scrub affected areas. Do not use bleaching creams, skin-lightening products or harsh exfoliants without checking with your team first — some can irritate treated skin or interact with your medicines.
**Call your team the same day if the colour change is accompanied by itching that keeps you awake, if the skin feels hot or tight, or if you notice any blistering or broken skin. Ordinary pigment change does not cause those symptoms.**
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Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
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Dr. Mohammed Imran
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MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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How do you tell cosmetic colour change from something that needs medical review?
| Feature | Cosmetic — monitor at home | Call today | Go to hospital now |
|---|---|---|---|
| Skin appearance | Darker or lighter patches, even in colour | Red, inflamed, or scaling skin | Blistering, raw, or peeling skin |
| Pain or sensation | None | Itching, tightness, or warmth | Burning pain or painful to touch |
| How fast it spreads | Gradual, stable over days or weeks | Slowly increasing over days | Spreading rapidly across body in hours |
| Fever | No | No | Yes — with any skin change |
| Typically starts | Weeks into treatment; often in skin folds, nail beds, and sun-exposed areas | Variable | Any time — can develop within hours |
Did you know?
White, vitiligo-like patches during immunotherapy are sometimes seen when the immune system is also active against pigment-producing cells in the tumour.
NCCN guidelines recommend monitoring these patches rather than treating them — they are not a sign that something has gone wrong.
Source: NCCN Guidelines for Management of Immunotherapy-Related Toxicities
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Common questions
Frequently asked questions
Will the skin colour change be permanent?
For most people, pigment changes from chemotherapy and targeted therapy fade gradually after treatment ends, though it can take several months. Changes in an area that received radiation may take longer and occasionally persist. Vitiligo-like patches from immunotherapy can be more lasting. Ask your oncologist what is typical for the specific treatment you are on, because the pattern differs between drugs and between individuals.
Why has the skin around my nails and in my skin folds turned dark?
Several chemotherapy agents cause darkening that appears first in skin folds, around the nail bed, and inside the mouth. Those areas are more sensitive to certain drugs. This is a cosmetic effect of treatment and does not mean the cancer is spreading or that treatment is harming you. Keep those areas moisturised, avoid picking at the nail bed, and mention it to your team so they can note it in your record.
Can I use turmeric or home remedies to lighten the skin?
There is no strong evidence that turmeric or similar preparations reverse treatment-related pigment change, and some can cause irritation on skin that is already sensitive. The more important reason to check first is that certain herbal ingredients can interact with treatment in ways that are not well documented. Tell your team what you are using or thinking of using — they will not judge you for asking, and it helps them give you safer guidance.
I have dark skin already — will I notice the change?
Pigment changes affect people of all skin tones. On darker skin, the change can be harder to see, especially when it is subtle darkening in areas that are already pigmented. You may notice instead that the nail beds or the inside of the mouth look different, or that the change is uneven. If you are unsure whether something you are seeing is a treatment effect, photograph it and show your team at the next visit — or call if it is changing quickly.
Is a tan-like darkening different from a rash?
Yes, and the difference matters. A gradual, even darkening without raised areas, heat, itching or pain is a pigment change — cosmetic, monitor at home. A rash usually feels different: it may be raised, itchy, warm, or red, and it can appear quickly. Any rash during immunotherapy or targeted therapy needs a same-day call, because immune reactions can look mild at first and progress. When in doubt, photograph it and call — your team would rather hear from you early.