It has a tendency to penetrate the cortex of jaw and present as an extra osseous soft tissue mass [6], [8]. [ijri.org]

Swelling of the upper lip can result from salivary tumor, regional infections inflammations and dentigerous cysts [3]. A cystic swelling of the hard palate may be the result of different kinds of cysts: odontogenic, non odontogenic or bone cysts. [ijri.org]

Upper lip swelling caused by a large dentigerous cyst. Eur Arch Otorhinolaryngol 2004; 5: (E pub ahead of print). 4. von Arx T. Anterior maxillary supernumerary teeth. A clinical and radiographic study. Aust Dent J 1992 ; 37(3) :189 - 195. 5. [ijri.org]