Case of actinic lichen planus: The second Japanese case

Abstract

A 20-year-old Japanese woman was referred to our department in November because of a 1-month history of eruptions on her face and the nape of her neck. She had experienced similar eruptions a year prior, but they had spontaneously disappeared. A physical examination revealed numerous redbrown violaceous annular plaques on her face (Fig. 1a,b) and the nape of her neck (Fig. 1c). The patient had no history of

Dyschromic actinic lichen planus

“…Genetic and geographical factors are also important. 4 It has been associated with intake of certain photosensitizing drugs, such as acitretin and hydrochlorothiazide. Three subtypes of actinic LP have been described: annular, pigmented/melasma-like, and dyschromic forms.…”

“…However, atypical features such as spongiosis, parakeratotic foci, and mucin deposition have also been described. 3,4 Exact pathogenesis of actinic LP is unknown. Sunlight likely plays a role with photo-Koebnerization as a proposed mechanism.…”

“…Currently, this rare disease has not been characterized with reflectance confocal microscopy (RCM), which has proven to be capable of characterizing melanocytic and nonmelanocytic skin lesions. 4 We report a case of cellular-type neurothekeoma located on the forehead of a young female, with a description of RCM images.…”

“…Histopathological features of actinic LP are usually like those of classical LP. However, atypical features such as spongiosis, parakeratotic foci, and mucin deposition have also been described 3,4 …”

“…Sunlight likely plays a role with photo‐Koebnerization as a proposed mechanism. Genetic and geographical factors are also important 4 . It has been associated with intake of certain photosensitizing drugs, such as acitretin and hydrochlorothiazide.…”