Vitiligo is an autoimmune skin condition that causes characteristic white patches on the skin. It affects people of all ages, skin tones and backgrounds — and despite not being medically dangerous, it can have a profound impact on self-esteem and quality of life.
In this article, we explain exactly what vitiligo is, what causes it, who gets it, and what you can do about it.
What is vitiligo?
Vitiligo is a non-contagious skin condition that occurs when the immune system mistakenly attacks and destroys melanocytes — the pigment-producing cells in the skin. The result is smooth, white patches (depigmented areas) that can appear anywhere on the body.
It is important to emphasise: vitiligo is not caused by anything you have done wrong, and it does not pose a threat to your overall health. It is classified as ED63.0 in the WHO's ICD-11.
What does vitiligo look like?
Vitiligo can present in various ways depending on the person and type:
- White, smooth patches: The depigmented areas are usually clearly defined and can range from a few millimetres to large parts of the body. They can appear on the face, hands, arms, legs and genitals.
- Loss of hair colour in depigmented areas: In some cases, hair growing in the vitiligo-affected areas also loses its colour and becomes white or grey.
- Loss of pigment in mucous membranes: Vitiligo can also affect the mucous membranes inside the mouth and nose.
Vitiligo is divided into two main forms. Non-segmental vitiligo is by far the more common: the patches typically appear symmetrically on both sides of the body, and its subtypes include generalised, acrofacial (hands and face), focal (a single patch or very few), mucosal (mucous membranes) and universal (almost all of the skin).
Segmental vitiligo is the other main form. It is one-sided and confined to a limited area, often corresponding to a nerve segment, usually begins early in life and normally stops spreading after the first year. The distinction between the two forms matters in practice, because they respond differently to treatment.
Why does vitiligo happen?
The exact cause is not yet fully understood, but research points to a combination of factors:
Why does the immune system attack the pigment cells?
The primary mechanism is autoimmune: T-lymphocytes (white blood cells) mistakenly identify melanocytes as foreign and attack them. This leads to progressive destruction of the pigment cells and the emergence of the characteristic white patches.
Is vitiligo hereditary?
Partly. Vitiligo occurs more frequently in certain families, suggesting a genetic component. Around 20% of people with vitiligo have at least one close relative — a parent, sibling or child — with the same condition. Specific gene variants linked to immune regulation have been identified in research, but heredity alone does not determine whether someone develops vitiligo.
What can trigger vitiligo?
Certain factors can trigger or worsen vitiligo in genetically predisposed individuals: severe stress or emotional trauma, skin injury (Köbner phenomenon — new patches appear at the site of injury), sunburn, and exposure to certain chemicals.
Is vitiligo linked to other autoimmune conditions?
Yes. Vitiligo is associated with an increased risk of other autoimmune diseases, including thyroid disease (Hashimoto's thyroiditis, Graves' disease), alopecia areata (patchy hair loss), type 1 diabetes and pernicious anaemia. Thyroid disease is by far the most common, which is why thyroid function (TSH) and thyroid autoantibodies should be checked when the diagnosis is made and periodically thereafter — even if you have no symptoms.
Who gets vitiligo?
Vitiligo affects around 0.5–2% of the world's population, with most estimates towards the lower end of that range, 0.5–1% — regardless of ethnicity, sex or age. However, certain patterns emerge:
- Early onset: Half of all cases begin before the age of 20, and many people notice their first patches during their teenage years.
- Family history: The risk is elevated if close family members have vitiligo or other autoimmune diseases.
- All skin types: Vitiligo occurs in everyone, but is often more visible — and therefore more psychologically distressing — in people with darker skin tones.
What can you do about vitiligo?
There is no known cure for vitiligo, but a range of treatment options can help slow the spread and in some cases restore some pigmentation:
Topical corticosteroids and immunomodulators
Steroid creams can reduce the immune attack on melanocytes and promote repigmentation, particularly for early and active patches. Calcineurin inhibitors (tacrolimus, pimecrolimus) are an alternative for sensitive areas such as the face.
Light therapy (phototherapy)
Narrowband UVB (nbUVB) phototherapy is currently the standard treatment for widespread vitiligo. It stimulates the remaining melanocytes to produce pigment again. PUVA (UVA combined with psoralen) is photochemotherapy proper and is now used only in specific cases.
New biological treatments
Ruxolitinib cream (Opzelura, a JAK inhibitor) blocks the immune pathway that destroys melanocytes and has shown promising repigmentation results. Its EU approval from 2023 is narrow, however: it covers non-segmental vitiligo with facial involvement in people aged 12 and over. If you have segmental vitiligo, or patches only on the body, you fall outside that indication. Reimbursement in Denmark is not general either, so discuss cost and individual reimbursement with your dermatologist.
Surgical options
For stable vitiligo, skin grafting or melanocyte transplantation may be considered. These methods are suitable for limited, inactive vitiligo and require specialist referral.
Sun protection and camouflage
Depigmented areas lack the natural sun filter melanin and burn easily. Always use sunscreen with high SPF (50+) on affected areas. Medical camouflage makeup can effectively cover the patches and improve quality of life.
Medical classification: Vitiligo is classified as ED63.0 in the WHO's International Classification of Diseases (ICD-11). It is characterised by autoimmune destruction of melanocytes leading to depigmented patches. Treatment includes phototherapy and topical steroids.
Frequently asked questions
Is vitiligo dangerous?
Vitiligo is not medically dangerous and does not affect overall health. However, the white patches increase the risk of sunburn, and the condition is associated with a slightly increased risk of other autoimmune diseases such as thyroid disease.
Can vitiligo be cured?
There is no known cure for vitiligo. However, many treatments can slow the spread and help restore some pigmentation, particularly narrowband UVB phototherapy and new JAK inhibitors. Results vary from person to person, and the face generally responds better than the hands and feet.
When should I contact a dermatologist?
Contact a dermatologist as soon as you notice white patches or depigmented areas. Early treatment gives the best chance of slowing the spread and achieving repigmentation. A dermatologist can also rule out other causes of white patches, such as pityriasis versicolor or hypopigmentation following eczema or psoriasis.
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Disclaimer: This article is for informational purposes only and does not replace professional medical advice. Always consult a doctor or dermatologist for personal guidance and assessment of skin changes.