Tiny white spots on your arms or legs: what could they mean?
Small white spots can have several causes, and their appearance alone usually isn’t enough to identify the condition.
Common possibilities include:
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Idiopathic guttate hypomelanosis (IGH): Small, flat, pale-white spots, often on the forearms and lower legs. They’re common with increasing age and sun exposure and are usually harmless.
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Vitiligo: Areas of skin lose pigment and become noticeably white. Patches may gradually enlarge or appear elsewhere.
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Tinea versicolor: A superficial fungal infection that can produce lighter or darker patches, sometimes with fine scaling.
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Post-inflammatory hypopigmentation: Skin can remain lighter after a rash, injury, burn, or infection.
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Sun-related changes: Repeated sun exposure can produce uneven pigmentation.
When to have them checked
Arrange a medical evaluation if the spots are new and rapidly spreading, becoming completely white, itchy or scaly, painful, bleeding, or associated with other skin changes.
If the spots are numerous, tiny, flat, and mainly on sun-exposed arms and legs in an older adult, IGH is one common explanation and isn’t generally dangerous.
A dermatologist can usually distinguish these conditions by examining the spots, sometimes using a special light. Avoid applying bleaching products or strong antifungal/steroid creams until you know what you’re treating.
