MyLibraryZotero17Souza, SouzaFurtat, Thaís MarquesReinisch, NicoleDario, Paulo Henrique PachecoOur Dermatology OnlineOur Dermatology Online367-368104420192019-10-032081939010.7241/ourd.20194.13Porokeratosis are morphologically distinct keratinization disorders, characterized clinically by papules or hyperkeratotic plaques surrounded by a linear raised border. Sometimes the border (the most characteristic change in porokeratosis, and practically the definition of diagnosis) is not easily identifiable. We demonstrated a clinical maneuver that facilitated the visualization of this more typical aspect in frame. A wooden tongue depressor was used to gently scratch one of the lesions. This maneuver revealed a desquamative halo in the hyperkeratotic lesion - better identifying the clinical aspect typical of the porokeratosis. The use of scratching may play a fundamental role in the diagnostic suspicion of porokeratosis and should be applied whenever the clinical history suggests this hypothesis as a differential diagnosis.Crossrefenhttp://www.odermatol.com/issue-in-html/2019-4-13-porokeratosis/D:\OurDermatolOnline\2019\numer 2019 4\pdf\13.Scratching-SouzaPRM.pdf2019-10-12 13:19:34