Lichenoid keratosis
Lichen planus—like keratosis
Definition
Lichen planus—like keratosis is a benign squamoproliferative lesion showing chronic inflammation and interface changes (likely representing active regression).
ICD-O code
8052/0
Synonym
Lichenoid keratosis
Epidemiology
This common lesion presents in adult-hood (mean age: 59 years), with a female-to-male ratio of 2:1. Lichen planus—like keratosis most frequently occurs in White populations.
Localisation
Lichen planus—like keratoses present as solitary lesions, most commonly on the trunk (in 76% of cases), followed by the limbs (in 33%), and uncommonly on the head and neck (in 3%).
Clinical features
Lichen planus—like keratoses are erythematous plaques with variable scale, measuring 5—20 mm. Dermoscopy shows irregular telangiectatic vessels and uniform clusters of grey dots .
Histogenesis
Lichen planus-like keratosis is a benign intraepidermal keratotic neoplasm.
Prognosis and predictive factors
Lichen planus—like keratosis is entirely benign.
Reference:
WHO classification of skin tumours, 4th edition (2018): 60-61.