Those Mysterious White Spots on Your Arms and Legs? Here’s What They Really Are—and Why You Likely Don’t Need to Worry

Those Mysterious White Spots on Your Arms and Legs? Here’s What They Really Are—and Why You Likely Don’t Need to Worry

If you’ve ever caught a glimpse of your arms or legs in natural light and noticed tiny, pale dots speckling your skin—especially as your summer glow begins to fade—you’re far from alone. These small, porcelain-white marks often become more noticeable against slightly tanned or naturally pigmented skin, standing out like delicate snowflakes on a sun-kissed canvas. For many people, they seem to appear gradually over the years, sometimes increasing in number with age, and can spark curiosity—or even mild concern.

You might have wondered: Are these spots a rash? A fungal infection? A sign of something more serious? The good news is that, in the vast majority of cases, these marks are completely benign. Dermatologists have a name for them: idiopathic guttate hypomelanosis, or IGH for short—and they’re far more common than you might think.

What Exactly Is IGH?

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