Author: A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand, 1999. Updated August 2015.
Vitiligo is an acquired depigmenting disorder of the skin, in which pigment cells (melanocytes) are lost. It presents with well-defined milky-white patches of skin (leukoderma). Vitiligo can be cosmetically very disabling, particularly in people with dark skin.
Vitiligo affects 0.5–1% of the population, and occurs in all races. It may be more common in India than elsewhere, with reports of up to 8.8% of the population affected. In 50% of sufferers, pigment loss begins before the age of 20, and in about 80% it begins before the age of 30 years. In 20%, other family members also have vitiligo. Males and females are equally affected.
Even though most people with vitiligo are in good general health, they face a greater risk of having autoimmune diseases such as diabetes, thyroid disease (in 20% of patients over 20 years with vitiligo), pernicious anaemia (B12 deficiency), Addison disease (adrenal gland disease), systemic lupus erythematosus, rheumatoid arthritis, psoriasis, and alopecia areata (round patches of hair loss).
A vitiligo-like leukoderma may occur in patients with metastatic melanoma. It can also be induced by certain drugs, such as immune checkpoint inhibitors (pembrolizumab, nivolumab) and BRAF inhibitors (vemurafenib, dabrafenib) used to treat metastatic melanoma. Vitiligo is also three times more common in haematology patients that have had allogeneic bone marrow and stem-cell transplants, than in the normal population.
Vitiligo is due to the loss or destruction of melanocytes, which are the cells that produce melanin. Melanin determines the colour of skin, hair, and eyes. If melanocytes cannot form melanin or if their number decreases, skin colour becomes progressively lighter.
Vitiligo is thought to be a systemic autoimmune disorder, associated with deregulated innate immune response, although this has been disputed for segmental vitiligo. There is a genetic susceptibility. Vitiligo is a component of some rare syndromes, such as the Vogt-Koyanagi-Harada syndrome. The gene encoding the melanocyte enzyme tyrosinase, TYR, is likely involved. It has been reported to be drug induced in association with the methylphenidate transdermal system.
Current investigations are evaluating the pattern of cytokines, particularly Interferon (IFN)-γ, and the role of the hair follicle in repigmentation.
Vitiligo can affect any part of the body. Complete loss of pigment can affect a single patch of skin, or it may affect multiple patches. Small patches or macules are sometimes described as confetti-like.
The colour of the edge of the white patch can vary.
The severity of vitiligo differs with each person. There is no way to predict how much pigment an individual will lose or how fast it will be lost.
It has been observed that patients that develop a form of vitiligo during treatment with an immune checkpoint inhibitor (such as nivolumab or pembrolizumab prescribed for metastatic melanoma) have enhanced survival rates compared to those who do not develop this complication of the treatment. A nationwide population cohort study published in 2019 reported that patients in Korea with a diagnosis of vitiligo had a reduced incidence of internal malignancies such as cancer of the colon, rectum, ovary and lung. The risk of melanoma and keratinocyte cancer also appears to be less in vitiligo patients than in similar patients without vitiligo. However, it should be noted that the risk of thyroid cancer is greater in patients with vitiligo compared to patients without vitiligo.
Classifications have identified clinical, genetic, pathobiological, epidemiological, and molecular characteristics of vitiligo.
The Vitiligo European Taskforce came to a consensus about the classification of vitiligo in 2007. They decided on four main categories with subtypes.
In most cases, the severity of vitiligo is not formally assessed. However, clinical photographs may be taken to monitor the condition.
At least two scoring systems have been devised for vitiligo and are used in clinical trials.
VASI is based on the PASI scoring system for psoriasis. It measures the extent and degree of depigmentation in 6 sites: hands, upper extremities, trunk, lower extremities and feet, head/neck.
VETF is based on SCORAD scoring system for atopic dermatitis. The VETF assesses the extent, staging and spreading/progression in 5 sites: head/neck, trunk, arms, legs and hands/feet. It grades from 0 (normal pigmentation) to 4 (complete hair whitening). Spreading is assessed using the following scores: 0 (stable disease), -1 (regressive disease) and +1 (progressive disease).
VETF includes a clinical assessment form to record the sex, age, duration of disease, age of onset, episodes of repigmentation, the impact of vitiligo on quality of life, family history, additional medical conditions and the Fitzpatrick skin type of the patients.
Vitiligo is normally a clinical diagnosis, and no tests are necessary to make the diagnosis. The white patches may be seen more easily under Wood lamp examination (black light).
Occasionally skin biopsy may be recommended, particularly in early or inflammatory vitiligo, when a lymphocytic infiltration may be observed. Melanocytes and epidermal pigment are absent in established vitiligo patches.
Blood tests to assess other potential autoimmune diseases or polyglandular syndromes may be arranged, such as thyroid function, B12 levels and autoantibody screen.
Clinical photographs are useful to document the extent of vitiligo for monitoring. Serial digital images may be arranged on follow-up. The extent of vitiligo may be scored according to the body surface area affected by depigmentation.
Treatment of vitiligo is currently unsatisfactory. Repigmentation treatment is most successful on face and trunk; hands, feet and areas with white hair respond poorly. Compared to longstanding patches, new ones are more likely to respond to medical therapy.
When successful repigmentation occurs, melanocyte stem cells in the bulb at the base of the hair follicle are activated and migrate to the skin surface. They appear as perifollicular brown macules.
Minimise skin injury: wear protective clothing.
Cosmetic camouflage can disguise vitiligo. Options include:
Topical treatments for vitiligo include:
Phototherapy refers to treatment with ultraviolet (UV) radiation. Options include:
Phototherapy probably works in vitiligo by two mechanisms.
Treatment is usually given twice weekly for a trial period of 3–4 months. If repigmentation is observed, treatment is continued until repigmentation is complete or for a maximum of 1–2 years.
A meta-analysis included 35 unique studies reporting outcome after phototherapy for generalised vitiligo. A marked or clinically useful response was achieved in 36% after 12 months of NBUVB and in 62% after 12 months of PUVA. Face and neck responded better than the trunk, which responded better than extremities. It was not very effective on hands and feet.
Systemic treatments for vitiligo include:
It is anticipated that monoclonal antibody biologic agents will be developed to treat vitiligo. To date, the results of JAK inhibitor trials in vitiligo have been encouraging, but there are high rates of relapse.
Surgical treatment for stable and segmental vitiligo requires removal of the top layer of vitiligo skin (by shaving, dermabrasion, sandpapering or laser) and replacement with pigmented skin removed from another site.
Depigmentation therapy, using monobenzyl ether of hydroquinone, may be considered in severely affected, dark-skinned individuals.
Vitiligo results in reduced quality of life and psychological difficulties in many patients, especially in adolescents and in females. The psychosocial effects of vitiligo tend to be more severe in some countries, cultures and religions than in others. Family support, counselling and cognitive behavioural treatment can be of benefit.
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