TY - JOUR T1 - Answers JF - Archives of disease in childhood - Education & practice edition JO - Arch Dis Child Educ Pract Ed SP - 237 LP - 237 DO - 10.1136/archdischild-2011-300972a VL - 96 IS - 6 AU - Vivian Y Shi AU - Peter A Lio Y1 - 2011/12/01 UR - http://ep.bmj.com/content/96/6/237.abstract N2 - From questions on page 209The 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 … ER -