The '5 Ps' (pruritic, purple, polygonal, planar papules and plaques) describe which of the following inflammatory dermatoses?
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Correct answer: Lichen planus
Lichen planus is a classic interface dermatitis. Histologically, it shows a dense, band-like infiltrate of lymphocytes at the dermo-epidermal junction and 'saw-tooth' rete ridges.
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