What is the most frequent oral sign observed in patients with infectious mononucleosis?

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Reddish-blue spots located near the upper molarsWhite pseudomembrane formation on the gumsTiny pinpoint petechiae appearing on the palateEnlargement of the gums

Explanation

Infectious mononucleosis often presents with small pinpoint petechiae on the palate, which is considered the most common oral manifestation. Other listed signs such as bluish-red spots near the maxillary molars, pseudomembranes on the gingiva, and gingival overgrowth are less typical in this condition.