Objective: To study the prevalence and profile of thyroid disease in a cohort of referred patients with oral lichen planus (OLP) in comparison with a random population sample and to examine the clinical characteristics of OLP patients with and without thyroid disease.
Study design: Data from 1611 patients with OLP and 1615 patients from the general population were collected by using a standardized registration method. Patients with OLP using levothyroxine (OLP/levothyroxine+) were re-examined to collect information about existing OLP lesions and to confirm the thyroid disease diagnosis. The clinical characteristics of OLP lesions in this group were compared with those in an age- and gender-matched population of patients with OLP without a history of thyroid disease or levothyroxine medication (OLP/levothyroxine-).
Results: Nearly 11% (n=170) of the patients with OLP were taking levothyroxine compared with 2.5% (n=40) of the controls (multivariate odds ratio 2.99, 95% confidence interval 2.03-4.44; P<.0001). No difference was found in the thyroid disease profile between the groups. At the time of re-examination, patients with OLP/levothyroxine- displayed more erythematous OLP lesions and complained of more severe symptoms compared with the OLP/levothyroxine+ group (P<.001).
Conclusions: The prevalence of thyroid disease in patients with OLP was significantly higher than in the general population. The OLP lesions of patients with concomitant thyroid disease have a different presentation over time, which indicates a specific subgroup of OLP.
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