NCIt definition : A rare hamartomatous papular lesion that arises from the hair follicle. It is characterized
by the presence of a central dilated infundibulum from which epithelial strands and
sebaceous glands emerge. The stroma is composed of collagen, spindle-shaped fibrocytes,
and mucin. Patients with Birt-Hogg-Dube syndrome may develop multiple follicular fibromas.;