Before biopsies, blood panels, or advanced imaging, most dermatologists reach for a handheld ultraviolet lamp. Here is what it actually shows, what it cannot show, and why the distinction between hypopigmentation and depigmentation matters for treatment.
August 9, 2026 · Verity Onwudiwe
ExplainerThe freckled, perifollicular pattern that appears during successful treatment is not random. It reflects where the skin keeps its reserve melanocytes, and it explains why some patches respond and others resist.
August 8, 2026 · Verity Onwudiwe
The freckle-like dots that appear inside a treated vitiligo patch are not a side effect. They are the treatment working. Here is the biology behind perifollicular repigmentation and how to read your own progress.
August 5, 2026 · Verity Onwudiwe
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ExplainerMost lists of hyperpigmentation causes stop at sun, hormones and acne marks. The part they leave out is that several of those same triggers, from a rash to a laser to a bleaching cream, can just as easily leave a white patch, and what decides the direction is whether the pigment cells survive the hit.
· Verity Onwudiwe
ExplainerWhether lost pigmentation can go away depends on one question nobody asks out loud at the first visit: are the pigment cells still there? Pale skin from a rash or a yeast usually refills in weeks to months, while the porcelain dots on aging shins essentially never do, and even vitiligo quietly repigments by itself in about one patient in five.
· Verity Onwudiwe
ExplainerHypomelanosis simply means less melanin than normal, but the version most adults actually search for is progressive macular hypomelanosis: soft pale patches on the back and belly that are routinely prescribed antifungals that cannot work. The entire controlled evidence base for treating it fits in fewer than 90 patients.
· Verity Onwudiwe
ExplainerThose freckle-like specks inside a treated patch are not random. They map directly onto hair follicles, and understanding why explains which areas respond to therapy and which resist it.
· Verity Onwudiwe
ExplainerPityriasis alba, tinea versicolor, post-inflammatory hypopigmentation, and idiopathic guttate hypomelanosis are misread as vitiligo every day. Here is the mechanism-level logic dermatologists use to tell them apart, and why the distinction changes treatment.
· Verity Onwudiwe
ExplainerThe freckle-like dots that appear inside a treated vitiligo patch are not random. They trace back to a reservoir of dormant pigment cells hiding in the hair root, and understanding that reservoir explains which patches respond to treatment and which rarely do.
· Verity Onwudiwe
§ 04 · Frequently Asked
Not currently, but treatments can restore pigment in many patients and stabilize active disease. Topical JAK inhibitors, phototherapy, and surgical options have all expanded the treatment landscape.
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