Premature or nevoid sebaceous hyperplasia? Two case reports of a rare disease.

Early or familial cases of sebaceous hyperplasia (SH) with multiple lesions, thought to be associated with genetic predisposition, have been reported in young individuals. Rarely reported variants include the giant, diffuse, zosteriform, and/or linear (nevoid) form. However, premature SH, defined as benign proliferation of sebaceous glands that occurs during or after puberty, is histologically similar to SH. Whether the definitions of nevoid SH or premature SH are the same remains unclear. We report two sporadic cases of premature SH.