The mean salivary leptin levels were as follows: Reticular OLP: 14.76 ± 7.55 ng/ml, bullous-erosive OLP: 15.45 ± 6.45 ng/ml, atrophic OLP: 16.80 ± 4.17 ng/ml, control group: 4.90 ± 1.26 ng/ml. This evidence concerns the gene LEP and oral lichen planus.