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Pityriasis (tinea) versicolor is a superficial fungal infection of the stratum corneum by the lipophilic yeast Malassezia spp. It is very common and can often be diagnosed clinically. We illustrate a simple but very useful clinical manoeuvre to help secure the diagnosis when mycologic examination is unavailable and the clinical diagnosis is uncertain: the evoked scale sign.
A 12-year-old African-American male presented with a 4-week history of multiple non-pruritic hyperpigmented lesions on his …