enanthema
/ˌɛnənˈθiːmə
/noun Medicine
An ulcer or eruption occurring on a mucus-secreting surface such as the inside of the mouth.An enanthema may be noted, and vesicles may evolve to shallow erosions, primarily on the palate.
Origin
Mid 19th century: from en-2 'within' + a shortened form of exanthema.