White spots on the arms or legs can have several causes, and they don’t automatically mean a vitamin deficiency or a serious disease.
Common possibilities include:
Vitiligo — an autoimmune condition in which pigment-producing cells are destroyed, creating clearly lighter or white patches. It can occur on the arms, legs, hands, face, and elsewhere.
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Tinea versicolor — an overgrowth of yeast on the skin that can produce lighter or darker, sometimes slightly scaly patches. It’s more common in warm, humid conditions.
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Post-inflammatory hypopigmentation — a lighter patch can remain after a rash, insect bite, injury, burn, or other skin inflammation.
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Idiopathic guttate hypomelanosis — small, flat, pale spots that are particularly common on sun-exposed areas as people age.
The appearance matters: completely white, sharply defined patches that are spreading are different from small, numerous spots with fine scaling.
If the spots are new, spreading, persistent, itchy/scaly, or accompanied by white hair in the affected area, a dermatologist can determine the cause. A Wood’s lamp examination may help distinguish vitiligo from other causes of pigment loss.
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Bottom line: white spots aren’t something to diagnose from a social-media checklist. They’re often harmless, but the right treatment depends on the underlying cause.
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