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  1. Vivian Y Shi1,
  2. Peter A Lio2
  1. 1College of Medicine, University of Illinois, Chicago, Illinois, USA
  2. 2Department of Dermatology and Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
  1. Correspondence to Peter Lio, Department of Dermatology and Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, IL 60622, USA; peterlio{at}gmail.com

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  1. The answer is A, lichen planus (LP). This patient presents with the classic ‘6 Ps’ seen in LP: purple, planar, pruritic, polygonal plaques and papules. Its surface has subtle white dots and lines in a reticulated pattern, called Wickham's striae. This finding is often visible only on close inspection. LP has a predilection for flexoral surfaces, though scalp, mucous membranes, nail and genital involvement may occur as well. Papular lesions erupting in a linear fashion after mechanical trauma, such as scratching, is known as the …

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