Lichen planus (LP) usually develops in middle age between 30 and 60 years and shows a slight female preponderance. In rare circumstances it may arise in childhood. In the US, prevalence is estimated to be less than 1%. In India, one study found that LP represents 0.38% of outpatient dermatology diagnoses. Cutaneous LP is the most common presentation, with hyper-trophic and actinic cutaneous forms being most common in the Indian population. Mucosal involvement is observed in less than 20% of patients. Erosive oral and genital ulceration mostly occurs in women. Nail changes are seen in about 15% of patients.
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