A Retrospective Cohort Study of Epidemiology and Clinical Outcome in Lichen Planus.

Dear Editor, Lichen planus (LP) is a chronic inflammatory, papulosquamous disease. A previous Singapore study reported that LP is more common in ethnic Indians.1 Other studies have reported that LP may be associated with metabolic syndrome-related diseases, such as hyperlipidaemia2,3 and diabetes mellitus.4,5 LP in Asians has not been well characterised, especially in Singapore which has a multiracial population. This retrospective cohort study aimed to assess the descriptive epidemiology of LP in Singapore, such as ethnicities, comorbidities, types of LP, and sites of involvement and its general outcome. This study also aimed to evaluate any associating factors with the disease outcome. This would be useful for the management of LP.