A Case of Localized Lichen Planus Pigmentosus on the Thigh

Lichen planus pigmentosus: two atypical presentation

“…Skin crease sparing may be explained by a relatively less sun exposure over the site for sitting habit. There are few reported cases of linear pattern [5], zosteriform pattern over trunk [6] and involvement of non sun exposed areas such as thigh [7] but to the best of our knowledge there is no reported case of band like distribution of LPP. The commonest differential diagnoses of the linear pigmentation in second case are incontinentia pigmenti, linear and whorled nevoid hypermelanosis but the late onset and histopathological findings ruled out these possibilities.…”

Segmental lichen planus pigmentosus: An unusual presentation

“…[23] Several pigmentary disorders with similar features have been reported in the literature under various names such as ashy dermatosis,[4] erythema dyschromicum perstans,[5] lichen pigmentosus, and “lichen invisible pigmentogene,”[6] with some clinical overlap. [7891011] LPP differs clinically from classical LP by exhibiting dark brown macules and/or papules and a longer clinical course without pruritus, scalp, nail, or mucosal involvement. LPP is most common over the sun-exposed areas such as the face, neck, and flexural folds including the axillary, inguinal, and submammary regions.…”

Linear lichen planus pigmentosus and coincidental ipsilateral facial nerve palsy: An unusual observation

“…Less common presentations include zosteriform pattern on the trunk [6], linear unilateral lesion on the extremity [7] and involvement of non sun-exposed areas such as thigh [8]. The cause of LPP is unknown, but an immunologic mechanism mediates its development, as well as that of lichen planus [9].…”