Oral lichen planus--a demographic study.

Among 20,333 Swedish people aged 15 yr and above, oral lichen planus was found in 1.9%; 1.6% among men and 2.2% among women. The highest prevalences were found in the age groups 65-74 and 55-64 yr. Reticular lichen planus was the most common type, found in 77.3%. The most prevalent intraoral location of lichen planus was the buccal mucosa, which was affected in 92%. Lichen planus was less prevalent among smokers than among non-smokers, except for the plaque type, which showed no difference in this context.