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Immunotherapy Side Effects · Skin Reactions
White Patches (Vitiligo) During Immunotherapy — Why Skin Loses Colour and What It Means
Patches of skin turning white during immunotherapy are a recognised immune-related skin change, most often seen during treatment for melanoma. They are painless, the skin stays intact, and they are not an emergency. They are also the one skin change families notice first — and the one that worries them most. This page explains why colour is lost, whether it comes back, and what it does and does not tell you.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- It is your immune system, not the cancer spreading — pigment cells are lost where immune activity reaches them. The patches are not tumour.
- Painless, and not an emergency — no blisters, no peeling, no mouth sores, no fever. Report it at your next visit, not on an urgent call.
- Cosmetically distressing, clinically reassuring — in melanoma it is described as a visible sign of immune activity, though it is never used as a test of whether treatment is working.
- Show it to your team, don't treat it yourself — no cream, lotion or repigmentation remedy without your oncology team, because it changes how the skin is assessed.
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Read this first
When Are Skin Changes on Immunotherapy an Emergency?
Loss of skin colour is not an emergency. It is painless and the skin surface stays intact. Other skin changes are urgent: blistering, peeling, sores in the mouth, eyes, nose or genital area, skin that hurts far more than it looks, or any rash with fever. Those need the emergency room the same hour.
Go to the nearest emergency room now, or call the CION helpline below, if any of these appear:
- Blisters anywhere on the skin, or skin that peels or comes away in sheets
- Sores, ulcers or crusting in the mouth, eyes, nose or genital area
- Skin that hurts, burns or stings far more than it looks like it should
- A rash spreading quickly, covering a large part of the body, or appearing with fever
- A skin change in someone who also feels breathless, confused or unusually unwell
A white patch on its own has none of these features. If any of them is present alongside it, the white patch is no longer the point — go now, and say you are on cancer immunotherapy as soon as you arrive.
Call the CION Helpline Now: 1800 202 8726
The short answer
Why Does Skin Lose Colour During Immunotherapy?
Because the immune system reaches your pigment cells. Immunotherapy releases the brakes on immune cells so they can attack cancer. Those released cells can also destroy melanocytes, the cells that make skin colour. Where melanocytes are lost, the skin turns white. The patch is immune activity, not cancer spreading into the skin.
This happens most often during treatment for melanoma, and there is a reason for that. Melanoma arises from pigment cells, so melanoma cells and healthy melanocytes carry some of the same surface markers. An immune response aimed at the tumour can recognise those same markers on normal skin. NCCN and ASCO immune-related adverse event guidance lists depigmentation as a recognised cutaneous immune-related effect of checkpoint inhibitor immunotherapy.
The same process affects hair. Some patients notice premature greying, or a white patch in an eyebrow, an eyelash or a section of scalp hair. Occasionally the pale patches show up as a ring of lighter skin around an existing mole. All of it comes from the same cause: pigment cells lost in that spot.
This is not the vitiligo that runs in families, and it is not contagious. Nobody in your household can catch it from you, and nothing you ate, applied or did wrong caused it.
Timing
When Do White Patches Appear on Immunotherapy?
Later than most skin reactions. A rash tends to arrive in the first two to six weeks. Loss of skin colour usually appears after about two to four months of treatment, and sometimes much later. Patches often start on sun-exposed skin — the face, neck, hands and forearms.
| Skin change | Typically starts | What it usually looks like | What to do |
|---|---|---|---|
| White patches (loss of skin colour) | After about 2–4 months, sometimes later | Well-defined pale or milk-white patches, often symmetrical, commonly on face, neck, hands and forearms | Mention it at your next scheduled visit — not urgent |
| White hair, eyebrow or eyelash patch | Around the same time or a little later | A section of hair losing colour, or premature greying | Mention it at your next scheduled visit — not urgent |
| Pale ring around an existing mole | Any time from about 2 months | A lighter halo of skin encircling a mole | Point it out at your next visit so the mole is examined |
| Itchy red rash (the common early one) | Weeks 2–6, often after cycle 1 or 2 | Flat or slightly raised red or pink patches on trunk and limbs | Tell your oncology team the same day |
| Dry, scaly or eczema-like skin | After about 6–12 weeks | Rough, flaky patches that may crack | Tell your oncology team the same day |
| Blistering or peeling skin | Can start at any point, including within days | Fluid-filled blisters, skin peeling, mouth or eye sores | Emergency — go to the ER now |
| White patches appearing after treatment ends | Weeks to months after the last dose | New pale patches when treatment is already finished | Report it and say you had immunotherapy |
These are the typical patterns described in NCCN and ASCO irAE guidance, not fixed rules. Timing varies between patients, and a skin change outside these windows still counts and still gets reported.
Normal versus red flag
Is Losing Skin Colour Normal, or a Warning Sign?
It is a recognised and expected immune-related change, not a warning sign. What makes it low-grade is that the skin stays whole: no blisters, no peeling, no soreness, no fever. If any of those appear, something different is happening and the urgency changes immediately.
| Feature | Loss of colour — mention at your next visit | Red flag — emergency care now |
|---|---|---|
| Appearance | Flat, well-defined pale or milk-white patches | Blisters, peeling skin, or skin that looks scalded |
| Skin surface | Intact and smooth — nothing broken | Broken, weeping, or coming away in sheets |
| Sensation | Painless; usually no itching either | Painful or burning, worse than it looks |
| Mouth, eyes, genitals | Not involved | Sores, ulcers or crusting in any of these |
| How fast it changes | Slow — spreads over weeks to months | Spreading over hours to a day or two |
| Alongside the skin change | Nothing else new | Fever, feeling unwell, breathlessness or confusion |
| Where to take it | Your next scheduled oncology visit | The emergency room, the same hour |
Everything on the left column is still reported — the difference is where you report it and how fast, not whether you do.
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Does the colour come back?
Is Vitiligo From Immunotherapy Permanent?
Often, yes — and the honest answer is that this is not fully known. Once pigment cells in an area are destroyed, the colour usually does not return, and patches that appear during treatment commonly persist afterwards. Some patients do see partial repigmentation over months or years. That cannot be predicted in advance.
Two things are worth separating here. The first is whether the patches stop spreading: in many patients they stabilise once treatment ends, though new patches can still appear for some time after the last dose. The second is whether existing patches refill with colour, which is much less predictable and much less common.
Long-term follow-up on skin changes after immunotherapy is genuinely immature. Be sceptical of any source offering you a confident ten- or twenty-year picture. Your team can tell you what has been observed; nobody can tell you what your own skin will do.
Did you know? Depigmented skin has no melanin left to protect it, so those patches burn far more easily than the skin around them — including on cloudy days and through a car window. This matters most for someone treated for melanoma. Ask your treating team what sun protection they want you to use on those areas, rather than choosing something yourself.
What it does and does not tell you
Is Vitiligo a Good Sign in Melanoma?
It is reassuring, not diagnostic. Loss of skin colour during immunotherapy for melanoma is described as a visible sign that the immune system is active against pigment-cell targets, and it has been reported alongside treatment response. It is not a test, and it cannot tell you how your own treatment will go.
This is the part of the page to read slowly, because it is easy to over-read in either direction. A white patch means immune cells are doing something visible. It does not measure how much they are doing inside the tumour, it does not forecast an individual patient's course, and no oncologist changes a treatment plan because a patch appeared. Response is assessed on scans and clinical examination — never on skin colour.
The reverse matters just as much. Not developing white patches is not bad news. Many patients respond to immunotherapy without a single skin change, and many patients with skin changes need their treatment reviewed for entirely separate reasons. If you have been watching your skin hoping for a sign, that is a reasonable thing to have done — and it is not a source of information you can use.
This is why we describe the association and stop there. Presenting depigmentation as a predictor would mean giving you a number that does not exist for your situation. NCCN and ASCO irAE guidance treats it as a recognised cutaneous event to be documented and graded, not as a response marker.
What to do
What Should You Do When White Patches Appear?
Document it and show your team — do not treat it yourself. First check it against the red-flag list above. If the skin is intact, painless and there is no fever, this goes on the agenda for your next scheduled visit rather than an urgent call.
- 1
Check the red flags first
Blisters, peeling, sores in the mouth, eyes or genitals, pain out of proportion, or fever. Any one of these means the emergency room now, not a note for your next visit.
- 2
Photograph the patches in daylight
Take a dated photo of each area every couple of weeks, in the same light. Depigmentation changes slowly, and a set of photos shows your team how fast far better than memory does.
- 3
Write down when you first noticed it
Note the date, where the first patch was, and roughly how many cycles you had received. Timing is part of how any immune-related change is assessed.
- 4
Ask your team about sun protection
Skin without pigment burns easily, and this matters especially after melanoma. Ask your treating team what they want you to use and how to cover those areas — they will answer for your specific situation.
- 5
Do not start any cream, oil or repigmentation remedy on your own
That includes over-the-counter creams, home remedies and anything recommended for ordinary vitiligo. Self-treatment changes how the skin looks and makes it harder to assess. Tell your team about anything you are already using.
- 6
Point out any mole that changes
A pale ring around a mole, or a mole changing size, shape, edge or colour, is examined — particularly after melanoma. Raise it even if it looks like part of the same skin change.
- 7
Ask whether a dermatology review would help
Your oncologist can arrange one if the patches are widespread or distressing. Cosmetic distress is a legitimate reason to ask — it does not have to be an emergency to be worth raising.
Living with it
How Do You Explain White Patches to Family?
Tell them three things: it is the immune system doing its job, it is not the cancer spreading to the skin, and it is not contagious. Those are the three fears families actually have. Answering them directly usually settles a household faster than any longer explanation.
This change lands hardest on younger patients, because it is visible, it often starts on the face and hands, and it arrives when everything else about treatment is already hard. Being upset about how your skin looks is not vanity and it is not ingratitude. Say it to your oncologist plainly — appearance-related distress is part of what a treating team is there to help with, and it can be referred on.
One practical point for Indian families. Pale skin patches carry social meanings here that have nothing to do with cancer, and relatives or neighbours sometimes ask uncomfortable questions. One plain sentence ready in advance — that it is a known effect of the cancer treatment and it is not infectious — saves a great deal of repeated explaining.
If you use cosmetic camouflage products, mention them so your team knows what is on the skin when they examine it. And if white hair, a pale eyebrow or a change in eye comfort appears alongside the patches, mention each one separately.
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Patients on immunotherapy at CION are monitored for immune-related reactions from the first infusion onward.
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Common questions
White Patches on Immunotherapy: Your Questions Answered
Why does skin lose colour during immunotherapy?
Immunotherapy releases the brakes on your immune system, and the immune cells it activates can attack melanocytes — the cells that make skin pigment. Where those cells are lost, the skin turns white. In melanoma this happens more often, because melanoma cells and normal pigment cells share some of the same surface markers, so an immune response aimed at the tumour can reach healthy pigment cells too. NCCN and ASCO list this as a recognised immune-related skin effect.
Is vitiligo after immunotherapy permanent?
Often it is — but the honest answer is that this is not fully known. Once pigment cells in an area are lost, the colour usually does not return, and patches that appear during treatment commonly persist after treatment ends. Some patients do see partial repigmentation over months or years, and that cannot be predicted in advance. Long-term follow-up data on skin changes after immunotherapy is still immature, so no one can promise you either outcome.
Are white patches a good sign in melanoma?
They are reassuring, not diagnostic. Loss of skin colour during immunotherapy for melanoma is described as a visible sign that the immune system is active against pigment-cell targets, and it has been reported alongside treatment response. It is not a test. It cannot tell you how your own treatment will go, and many patients respond without ever developing a white patch. Your scans and your oncologist's assessment answer that question, not your skin.
When do white patches usually appear on immunotherapy?
Later than most skin reactions. A rash tends to appear in the first two to six weeks, whereas loss of skin colour usually shows up after about two to four months of treatment, and sometimes much later. Patches often start on sun-exposed skin — the face, neck, hands and forearms — and hair can be affected as premature greying or a white patch in the eyebrow, eyelash or scalp. New patches can also appear after treatment has finished.
Is vitiligo on immunotherapy an emergency?
No. Depigmentation itself is painless. The skin stays intact, there is no blistering, no peeling, no sore in the mouth or eyes and no fever. It is reported at your next scheduled visit, not on an emergency call. Other skin changes are emergencies: blisters, peeling skin, sores in the mouth, eyes, nose or genital area, skin that hurts far more than it looks, or any rash with fever. Those need the emergency room the same hour.
Will immunotherapy be stopped because of white patches?
Usually not. Loss of skin colour is graded as a low-grade skin event and treatment normally continues unchanged, because the patches do not damage the skin or threaten any organ. Your team will still examine the skin at every visit to confirm nothing else is developing alongside it. Treatment decisions change only if a different and more serious skin reaction appears — blistering, peeling or mucosal involvement — or if another immune-related problem needs attention.