Hair follicle nevus explained

Synonym:	Vellus hamartoma
Specialty:	Dermatology

Hair follicle nevus is a cutaneous condition that presents as a small papule from which fine hairs protrude evenly from the surface.^[1]

Signs and symptoms

Hair follicle nevus usually presents as a single, skin-colored papule or nodule on the face after birth that exhibit no symptoms.^[2]

Diagnosis

Histologically, vellus hair follicle growth with perifollicular fibrous thickening occasionally encircled by a cellular stroma is the hallmark of hair follicle nevus. Smooth muscle fibers and eccrine and sebaceous glands are at times visible.^[2]

See also

• Skin lesion
• List of cutaneous conditions

Further reading

• Larson . Krista N. . O'Shea . Patrick . Zedek . Daniel C. . Morrell . Dean S. . Hair Follicle Nevus Located on the Chin of an Infant: Case Report and Review of Literature . Pediatric Dermatology . Wiley . 33 . 2 . 2016 . 0736-8046 . 10.1111/pde.12825 . 27001331 . none.
• Harada . Kazutoshi . Kato . Yuichiro . Kato . Yukihiko . Tsuboi . Ryoji . Hair Follicle Nevus with Sebaceous Hyperplasia: A Dermoscopic Observation . Case Reports in Dermatology . 7 . 3 . 2015-12-23 . 1662-6567 . 26955332 . 4777908 . 10.1159/000442969 . 358–362 . none.

External links

• VisualDx
• Pathology Outlines

Notes and References

1. Book: Rapini, Ronald P. . Bolognia, Jean L. . Jorizzo, Joseph L. . Dermatology: 2-Volume Set . Mosby . St. Louis . 2007 . 978-1-4160-2999-1 .
2. Lee . Ji Su . Yang . Ji Hoon . Park . Hyunsun . Yoon . Hyun-Sun . Cho . Soyun . Hair Follicle Nevus Located on the Neck: Comparison with Accessory Tragus, Cervical Chondrocutaneous Branchial Remnants and Trichofolliculoma . Annals of Dermatology . Korean Dermatological Association and The Korean Society for Investigative Dermatology . 31 . 6 . 2019 . 662–665 . 1013-9087 . 10.5021/ad.2019.31.6.662 . 33911666 . 7992593 .