A 40-year-old man came to a dentist with complaints of a neoplasm on the mucosa of the lower lip. The neoplasm appeared approximately one month ago and is slowly increasing in size. Objectively, under the lower lip mucosa there is a formation 0.7 cm in size. The formation is circumscribed, elastic, painless, round, and translucent. The mucosa over the formation is thinned-out, while surrounding mucosal remains unchanged. What diagnosis can be made in this case?