A 3 year old patient complains of pain of the mouth and headaches for 24 hours. The clinical exam reveals bilateral painful regional lymphadenopathy and bad breath. Vesicles are seen on the hard palate, the soft palate, the gingiva, the tongue and the lips. The patient’s temperature is 38.5ºC. What is the most probable diagnosis?

Primary herpetic gingivostomatitis.

Erythema multiforme.

Hand-foot-mouth disease.

Herpetiform aphtaus ulcers.