What Is Vitiligo? Why White Patches Develop and How They Are Assessed
VITILIGO AND WHITE PATCHES
Vitiligo may come to mind when a white patch appears, but fungal disease, post-inflammatory colour change, birthmarks and other conditions can look similar. Diagnosis should come before treatment.
What is vitiligo?
Vitiligo is an acquired chronic depigmentation condition caused by loss of functioning melanocytes. Patches may be milk-white with distinct borders. It is not contagious and does not spread through touch or shared objects.
How can vitiligo appear?
Milk-white patches
Hands, face, around the mouth or eyes, elbows, knees, armpits and genital skin may be affected.
Symmetrical or localised pattern
It may affect similar sites on both sides or remain confined to one region.
White hair in a patch
Hair within a patch may lose colour, including scalp hair, eyebrows or eyelashes.
Variable course
Some patches remain stable while others enlarge or new areas develop.
Why does vitiligo develop?
Vitiligo is complex, with autoimmune mechanisms, genetic susceptibility and environmental factors contributing. Stress, nutrient deficiency or sun exposure alone should not be labelled as the sole cause. Friction and injury may influence new patches in some people.
Vitiligo should not be dismissed as only cosmetic. Possible autoimmune associations such as thyroid disease and the psychosocial impact should be considered individually.
Is every white patch vitiligo?
No. Tinea versicolor, post-inflammatory hypopigmentation, pityriasis alba, chemical exposure and some birthmarks may resemble it. Examination, Wood’s lamp assessment and selected tests can support diagnosis. Photography can document extent and change.
How is management planned?
- Extent, site, speed of change, age and quality of life are assessed.
- Site-appropriate topical treatment may be considered for limited disease.
- Phototherapy may be considered for extensive or progressive disease.
- Response varies on the face, hands and feet, and where hair has turned white.
- Sun protection, camouflage and psychological support may form part of care.
Daily considerations
- Avoid sunburn and use appropriate protection.
- Consider skin-camouflage products if desired.
- Avoid unregulated herbal or irritating preparations.
- Photographs in consistent lighting can help monitor change.
- Do not minimise emotional impact; seek support when needed.
Note: Not every patch responds at the same speed or to the same method. Claims of a guaranteed permanent cure are unrealistic; goals include stabilisation and supporting repigmentation where possible.
When should you see a dermatologist?
Rapid spread, new patches, diagnostic uncertainty or quality-of-life impact warrant assessment. See vitiligo assessment.
Frequently Asked Questions
Facts about contagion, progression, sun and response.
1Is vitiligo contagious?
No. It does not spread through touch, towels, swimming or shared living.
2Does vitiligo progress?
The course varies. It may remain stable or new areas may develop.
3Is sunlight harmful?
Depigmented skin burns more easily and needs protection. Medical phototherapy is not the same as uncontrolled sun exposure.
4Can vitiligo disappear completely?
Repigmentation may occur in some sites; response varies with site, duration and activity.