Oral hairy leukoplakia in AIDS is caused by herpes virus infection. It is characterized by thickened white patches, usually on both sides of the tongue, most often bilaterally, but asymmetrically. The surface is wrinkled and resembles a corduroy-like appearance, and in advanced stages may have a hairy appearance, sometimes on the buccal mucosa and floor of the mouth. Oral trichomegaly is not malignant and usually does not require treatment. Patients with AIDS also develop fungal infections due to decreased immunity, resulting in thrush in the mouth, which manifests as a white film on the buccal mucosa, tongue, palate, and oropharynx that can be easily scraped from the mucosal surface. There can be no conscious symptoms, and some patients may also experience changes in taste, burning sensation, or dry mouth.