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Clinical and dermatoscopic characteristics of lichen planus‐like keratosis in a West‐Asian population
Author(s) -
Ansari Mahshid Sadat,
Akay Bengu Nisa,
Cengiz Fatma Pelin,
Rosendahl Nikita,
Mahmoudi Hamidreza,
Daneshpazhooh Maryam,
Rosendahl Cliff
Publication year - 2021
Publication title -
australasian journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.67
H-Index - 53
eISSN - 1440-0960
pISSN - 0004-8380
DOI - 10.1111/ajd.13455
Subject(s) - dermatoscopy , dermatology , keratosis , medicine , population , lichen , oral lichen planus , incidence (geometry) , hyperkeratosis , biology , melanoma , botany , physics , environmental health , cancer research , optics
Background/Objective The clinical and dermatoscopic features of lichen planus‐like keratosis have been described but the characteristics of this entity in a West‐Asian population are not known. Methods We retrospectively analysed 82 histopathologically verified cases of lichen planus‐like keratosis from 81 patients from Iran and Turkey. Results The majority of lichen planus‐like keratoses were macules (61% n = 50), clinically pigmented (67.1% n = 55) and dermatoscopically multi‐coloured (91.5% n = 75). The majority (63.4%) had a single dermatoscopic pattern, most frequently: structureless (35.4%), dots (14.6%) and angulated lines (8.5%). Of the lesions with more than one pattern ( n = 30), the majority ( n = 21) had asymmetry of pattern, the most common combinations being structureless plus dots ( n = 8) and structureless plus angulated lines ( n = 5). The most common structure was pigmented dots, most frequently grey and present in 70.7% of cases. Vessels were seen in 30.5% of lesions, being significantly more prevalent in non‐pigmented, than pigmented, lichen planus‐like keratoses (83.3% vs. 21.4% P < 0.001 ). When we compared lichen planus‐like keratosis in the current study to that entity in a large North American study, the statistically significant differences in a West‐Asian population included a greater frequency of pigmented variants, a lower incidence in females and a lower prevalence on the torso, in favour of the face. Conclusions Lichen planus‐like keratosis in a West‐Asian population has clinical and dermatoscopic similarities to that entity in another studied population. The significant differences in gender association and anatomical site may be secondary to cultural factors.