Mucoceles are benign lesions of the minor salivary glands that are common in children. The most frequent localizations of these lesions include the lower lip and the cheek mucosa. Such mucoceles are caused by traumas, the rubbing of orthodontic devices, or biting habits. The purpose of this article was to describe the case of a 4-mm extravasation mucocele located on the lower lip of a 9-year-old girl. This mucocele was removed with an erbium loser after perilesional infiltration with 12 mg of 2% lidocaine and epinephrine 1:100,000. The histopathological report confirmed the presurgical diagnosis. The wound healed excellently and rapidly without sutures. No relapse was observed a year ofter the surgery. Lasers apply modern technology and are useful for soft tissue surgery in pediatric dentistry, as operations are rapid and wounds heal well without sutures.