Tongue ulcer in a 7-month-old infant.

On examination, the infant presented a round indurated ulcer that measured 1× 1 cm and had well-defined borders. The ulcer was situated on the ventral surface of the tongue, coincident with the lower incisor teeth (Fig. 1). A whitish exudate covered the base of the lesion, in which there were 2 deeper linear ulcers. There were no palpable cervical lymph nodes and no other skin or mucosal lesions. The child presented good height and weight gain and neurological examination was normal.