Microscopic examination showed a dense lichenoid infiltrate of lymphocytesand melanophages in the papillary dermis. The epidermis showed irregular hyperplasia,jagged rete ridges, vacuolar alteration, hypergranulosis, and compact orthokeratosis.
Linear lichen planus is a well-recognized but rare entity that was firstdescribed by Devergie in 1854.1 It occursin 0.24% to 0.62% of all patients with lichen planus.2- 4It is more common in children5 but hasoften been reported in adults. Clinically, there are violaceous papules andplaques in a zosteriform and unilateral distribution, usually over 1 extremity.Occasionally, the eruption may appear to follow the lines of Blaschko.6 Linear lichen planus is pruritic and violaceousand often lasts for more than 1 year. Lesions are usually scattered over theextremities but have been reported on the chest and trunk.5,6Linear lichen planopilaris on the face has been reported.7
Pruritic Linear Eruption on a Child. Arch Dermatol. 2001;137(1):85-90. doi: