Oral hairy leukoplakia arising in an oral lichen planus lesion in an otherwise immune-competent patient.

Oral hairy leukoplakia (OHL) presents clinically as thickened white plaques which cannot be rubbed off, and is most often found on the lateral margin of the tongue. The name is derived from its often hairy appearance. OHL has clinical significance because of its association with HIV infection, and it is rare in immune-competent people. We report on a case of unilateral OHL which arose in an oral lichen planus lesion in an immune-competent patient.