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From questions on page 209
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 …
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.