Use of Wood's lamp to diagnose progressive macular hypomelanosis

Progressive macular hypomelanosis (PMH) (Fig 1) is not uncommon, but it is frequently misdiagnosed as tinea versicolor or postinflammatory hypopigmentation, or else multiple biopsy samples are collected to rule out hypopigmented mycosis fungoides. Accurate diagnosis is very important, as treatment of this condition is readily available, is easy, and may have a huge impact on patient quality of life. What can be done to prevent this misdiagnosis?

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