The short explanation
Several things can cause white or light patches on the skin, and one of them is vitiligo, where the skin loses its pigment cells because of an immune process. Vitiligo is not contagious. It cannot spread to others by touch, food, sharing utensils or living together. It is also not caused by eating certain food combinations, by sin or by bad luck, despite common beliefs. Other causes of light patches include a fungal infection, dry skin patches called pityriasis alba, marks left after eczema or injury, and rarely other conditions. A dermatologist can usually tell the cause by looking at the patch, sometimes using a special lamp. If it is vitiligo, there are treatments that may help stop spreading and bring back colour in some areas, and they tend to work better when started early.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Vitiligo can run in families and is sometimes linked with thyroid problems, so a thyroid test may be suggested.
- The emotional impact of vitiligo, especially with stigma from family or society, can be heavy. It is fair to ask the doctor to explain the condition to family members.
- Sun protection on light patches helps prevent sunburn, as these areas have less natural protection.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you whether your patch is vitiligo or something else. A dermatologist needs to examine it.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Is this vitiligo or something else?
- Can you explain to my family that it is not contagious?
- What treatment options are there if it is vitiligo?
- Should my thyroid be checked?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Book an appointment soon
- See a doctor within a few days if the patch is numb, or new patches are appearing quickly.
Raise it at a routine appointment
- Book a routine dermatology appointment to confirm the cause and discuss options.
Sources
The evidence this explanation is built on.
- Skin conditions MedlinePlus (US National Library of Medicine)
- Underactive thyroid (hypothyroidism) NHS
- Fungal infections MedlinePlus (NIH)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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