Geographic Tongue (Benign Migratory Glossitis)This painless condition is characterized by inflamed, irregularly shaped areas on the dorsum of the tongue that are devoid of filiform papillae. Lesions are red, slightly depressed, and bordered by a whitish band (Fig. 20-18). Spontaneous healing followed by the formation of similar lesions elsewhere on the tongue results in a migrating appearance. Etiology is unknown; however, strong association with stress and allergies is suspected. Although benign, the course of this disorder may be prolonged for months, and it may recur.