Epidemiology

Lichen planus (LP) usually develops in middle age between 30 and 60 years and shows a slight female preponderance.[2] In rare circumstances it may arise in childhood.[20][21] In the US, prevalence is estimated to be less than 1%.[2][22] In India, one study found that LP represents 0.38% of outpatient dermatology diagnoses.[23] Cutaneous LP is the most common presentation, with hyper-trophic and actinic cutaneous forms being most common in the Indian population.[23]com.bmj.content.model.Caption@35cdae0[Figure caption and citation for the preceding image starts]: Cutaneous lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].com.bmj.content.model.Caption@17879a8e[Figure caption and citation for the preceding image starts]: Blaschkoid lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].com.bmj.content.model.Caption@7df65e09[Figure caption and citation for the preceding image starts]: Blaschkoid lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].com.bmj.content.model.Caption@f403914[Figure caption and citation for the preceding image starts]: Inverse lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].com.bmj.content.model.Caption@6aae69c6[Figure caption and citation for the preceding image starts]: Hypertrophic lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].com.bmj.content.model.Caption@4156ddf7[Figure caption and citation for the preceding image starts]: Hypertrophic lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends]. Mucosal involvement is observed in less than 20% of patients. Erosive oral and genital ulceration mostly occurs in women.com.bmj.content.model.Caption@e1fd5c2[Figure caption and citation for the preceding image starts]: Oral lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].com.bmj.content.model.Caption@99d58c[Figure caption and citation for the preceding image starts]: Genital lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends]. Nail changes are seen in about 15% of patients.[23]com.bmj.content.model.Caption@19607c00[Figure caption and citation for the preceding image starts]: Ungual lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].com.bmj.content.model.Caption@6eaeb3be[Figure caption and citation for the preceding image starts]: Ungual lichen planusMayo Clinic clinical photographs (used with permission) [Citation ends].

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