"Hereditary Gingival Fibromatosis (HGF) is a rare benign, slowly progressive inflammatory fibrous hyperplasia of the maxillary and mandibular gingiva"
Essentially, it's a genetically related puffiness/hyper-growth of the gums. (An image search for Hereditary Gingival Fibromatosis on Google will provide a number of images)
Source: Philips E, Functional and Aesthetic Rehabilitation of a Patient with Hereditary Gingival Fibromatosis, Oral Health Labs, pg 14-15, Fall/Winter 2013.
Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)