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Updated: Jul 7, 2026

Isolating Hair Follicle Stem Cells and Epidermal Keratinocytes from Dorsal Mouse Skin
Published on: April 29, 2016
Hair follicle nevus in a 2-year old
Sei-ichiro Motegi1, Hiroo Amano, Atsushi Tamura
1Department of Dermatology, Gunma University Graduate School of Medicine, Gunma, Japan. smotegi@showa.gunma-u.ac.jp
Abstract:
We report a 2-year-old boy with an elastic soft, flatly elevated, skin-colored nodule on his nasal ala. Histologic examination revealed numerous small hair follicles in several stages of maturation in the dermis. Serial sections did not show any cartilage or a central epithelial lined cystic structure. Based on clinico-pathologic findings, we diagnosed this lesion as a hair follicle nevus. Hair follicle nevus is quite rare. Histologically, it is very important not to find cartilage or a central epithelial lined cystic structure for distinction from an accessory auricle and from a trichofolliculoma, respectively. Awareness of the clinical and pathologic characterization of hair follicle nevus is an aid to a correct diagnosis.
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