Stomatitis of exposure to the allergen. Migratory stomatitis (or geographic stomatitis) is an atypical presentation of a condition which normally presents on the tongue, termed geographic tongue. Geographic tongue is so named because there are atrophic, erythematous areas of depapillation that migrate over time, giving a map-like appearance. In migratory stomatitis, other mucosal sites in the mouth, such as the ventral surface (undersurface) of the tongue, buccal mucosa, labial mucosa, soft palate, or floor of mouth may be afflicted with identical lesions, usually in addition to the tongue. Apart from not being restricted to the tongue, migratory stomatitis is an identical
Aphthous stomatitis ulcers appear at the same time, but single ulcers are possible. Healing usually takes seven to ten days and leaves no scar. Between episodes of ulceration, there is usually an ulcer-free period of variable length. This subtype makes up about 10% of all cases of aphthous stomatitis. It is termed major aphthous ulceration (MaAU) or major recurrent aphthous stomatitis (MaRAS). Major aphthous ulcers (major aphthae) are similar to minor aphthous ulcers, but are more than 10 mm in diameter and the ulceration is deeper. Because the lesions are larger, healing takes longer (about twenty to thirty days), and may leave