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In order to investigate the role of TNF-α and ICAM-1 in the pathogenesis of lichen planus, immunohistechemistty was used to detect the expression of TNF-α and ICAM-1 in skin le- sions of the patients with lichen planus and skin tissues of normal subjects. The results showed that positive rates of TNF-α and ICAM-1 expressions in lichen planus were significantly higher than those in normal skins (both P