Overview
Vitiligo causes milky-white patches, often on the face, hands, around the mouth, and genitals. It may spread over time and is linked to autoimmune conditions like thyroid disease.
Tinea versicolor causes light or dark scaly patches on the chest and back, more noticeable after sun exposure. Pityriasis alba causes pale, dry patches on children's faces. Rarely, numb light patches can signal other conditions.
When to get medical care
Causes
Causes include vitiligo, tinea versicolor, pityriasis alba, post-inflammatory hypopigmentation, idiopathic guttate hypomelanosis (sun-related small spots), and, rarely, Hansen's disease or skin lymphoma.
OwieClear has pages on 2 conditions that can cause patches of skin losing color. Each shows how soon to get care.
Common causes
- Pale patches on the skin (pityriasis alba or after a rash)Often treated at home
Lighter patches of skin, often on a child's face, arms, or upper body, or where a rash or injury has healed.
- VitiligoSee a doctor if it doesn't get better
Smooth white patches where the skin loses its color, often on the face, hands, and around the mouth.
What you can do at home
- Use sunscreen on patches to prevent burning.
- Use cosmetics to blend if you wish.
- Seek support if it affects how you feel.
Medicines
Vitiligo may be treated with steroid or calcineurin creams, ruxolitinib cream, or light therapy. Tinea versicolor is treated with antifungal shampoos or creams.
At the doctor
The provider will look at the patches, sometimes under a special light.
Questions you may be asked
- When patches appeared
- Spreading
- Itching or scaling
- Family history
- Thyroid or autoimmune conditions
The exam
A skin exam, often with a Wood's lamp.
Tests
- Skin scraping for yeast
- Thyroid tests
Prevention
Protect your skin.
- Use sunscreen
- Treat skin conditions early
Check your symptoms
Most symptoms have more than one possible cause. The symptom checker looks at all of your symptoms together, plus your age, and shows how soon to get care.
Sources
Last updated 2026-11-13.